diff --git a/backend/agenteval/models.py b/backend/agenteval/models.py
index 5eac6ca..5b6a908 100644
--- a/backend/agenteval/models.py
+++ b/backend/agenteval/models.py
@@ -164,6 +164,8 @@ class EvalRun(BaseModel):
     scenario_id: str
     # 创建时快照的场景考纲版本（ADR-0001）
     scenario_version: int = 1
+    # 归属的评估活动（Campaign）；手动/单次运行为空
+    campaign_id: Optional[str] = None
     status: RunStatus = RunStatus.PENDING
     triggered_by: RunTrigger = RunTrigger.MANUAL
     started_at: Optional[datetime] = None
@@ -171,6 +173,41 @@ class EvalRun(BaseModel):
     summary: Optional[dict[str, Any]] = None
 
 
+class CampaignStatus(str, Enum):
+    """Lifecycle of an evaluation campaign (评估活动)."""
+
+    PLANNED = "planned"
+    RUNNING = "running"
+    COMPLETED = "completed"
+    CANCELLED = "cancelled"
+    FAILED = "failed"
+
+
+class CampaignPlanEntry(BaseModel):
+    """One static plan item: run a scenario N times at a window offset."""
+
+    scenario_id: str
+    offset_seconds: int = Field(ge=0)
+    count: int = Field(default=1, ge=1)
+
+
+class Campaign(BaseModel):
+    """An evaluation campaign: a service-cycle window over a single target,
+    driving many child Runs from a static plan (ADR-0003)."""
+
+    id: Optional[str] = None
+    name: str
+    target_id: str
+    window_seconds: int = Field(gt=0)
+    time_scale: float = Field(default=1.0, gt=0)
+    plan: list[CampaignPlanEntry] = Field(min_length=1)
+    status: CampaignStatus = CampaignStatus.PLANNED
+    started_at: Optional[datetime] = None
+    completed_at: Optional[datetime] = None
+    created_at: Optional[datetime] = None
+    summary: Optional[dict[str, Any]] = None
+
+
 class Turn(BaseModel):
     """A single turn in a conversation during evaluation."""
 
diff --git a/backend/agenteval/storage/db.py b/backend/agenteval/storage/db.py
index 0c615df..91c2732 100644
--- a/backend/agenteval/storage/db.py
+++ b/backend/agenteval/storage/db.py
@@ -160,6 +160,36 @@ class ScenarioModelBindingDB(SQLModel, table=True):
     model_config_id: str = Field(foreign_key="model_configs.id", index=True)
 
 
+class CampaignDB(SQLModel, table=True):
+    """Database table for evaluation campaigns (评估活动)."""
+
+    __tablename__ = "campaigns"
+
+    id: Optional[str] = Field(default_factory=new_uuid, primary_key=True)
+    name: str
+    target_id: Optional[str] = Field(default=None, foreign_key="eval_targets.id")
+    window_seconds: int
+    time_scale: float = 1.0
+    plan: str = "[]"
+    status: str = "planned"
+    started_at: Optional[datetime] = None
+    completed_at: Optional[datetime] = None
+    created_at: Optional[datetime] = Field(default_factory=utc_now)
+    summary: Optional[str] = None
+
+    def get_plan(self) -> list[dict[str, Any]]:
+        return json.loads(self.plan)
+
+    def set_plan(self, plan: list[dict[str, Any]]) -> None:
+        self.plan = json.dumps(plan, ensure_ascii=False)
+
+    def get_summary(self) -> Optional[dict[str, Any]]:
+        return json.loads(self.summary) if self.summary else None
+
+    def set_summary(self, summary: dict[str, Any]) -> None:
+        self.summary = json.dumps(summary, ensure_ascii=False)
+
+
 class EvalRunDB(SQLModel, table=True):
     """Database table for evaluation runs."""
 
@@ -169,6 +199,7 @@ class EvalRunDB(SQLModel, table=True):
     target_id: Optional[str] = Field(default=None, foreign_key="eval_targets.id")
     scenario_id: Optional[str] = Field(default=None, foreign_key="scenarios.id")
     scenario_version: int = Field(default=1)
+    campaign_id: Optional[str] = Field(default=None, foreign_key="campaigns.id")
     status: str = "pending"
     triggered_by: str = Field(default="manual")
     started_at: Optional[datetime] = Field(default_factory=utc_now)
diff --git a/backend/agenteval/storage/repository.py b/backend/agenteval/storage/repository.py
index 024db12..fc3e2d0 100644
--- a/backend/agenteval/storage/repository.py
+++ b/backend/agenteval/storage/repository.py
@@ -4,9 +4,10 @@ from typing import Optional
 
 from sqlmodel import Session, select
 
-from agenteval.models import Case, EvalResult, EvalRun, EvalTarget, Scenario
+from agenteval.models import Campaign, Case, EvalResult, EvalRun, EvalTarget, Scenario
 from agenteval.services.model_configs import ModelConfigService
 from agenteval.storage.db import (
+    CampaignDB,
     EvalResultDB,
     EvalRunDB,
     EvalTargetDB,
@@ -84,6 +85,7 @@ def _run_to_db(run: EvalRun) -> EvalRunDB:
         target_id=run.target_id,
         scenario_id=run.scenario_id,
         scenario_version=run.scenario_version,
+        campaign_id=run.campaign_id,
         status=run.status.value,
         triggered_by=run.triggered_by.value,
         started_at=run.started_at,
@@ -100,6 +102,7 @@ def _run_from_db(db: EvalRunDB) -> EvalRun:
         target_id=db.target_id,
         scenario_id=db.scenario_id,
         scenario_version=db.scenario_version or 1,
+        campaign_id=db.campaign_id,
         status=db.status,
         triggered_by=db.triggered_by or "manual",
         started_at=db.started_at,
@@ -108,6 +111,40 @@ def _run_from_db(db: EvalRunDB) -> EvalRun:
     )
 
 
+def _campaign_to_db(campaign: Campaign) -> CampaignDB:
+    db = CampaignDB(
+        id=campaign.id,
+        name=campaign.name,
+        target_id=campaign.target_id,
+        window_seconds=campaign.window_seconds,
+        time_scale=campaign.time_scale,
+        status=campaign.status.value,
+        started_at=campaign.started_at,
+        completed_at=campaign.completed_at,
+        created_at=campaign.created_at,
+    )
+    db.set_plan([entry.model_dump(mode="json") for entry in campaign.plan])
+    if campaign.summary:
+        db.set_summary(campaign.summary)
+    return db
+
+
+def _campaign_from_db(db: CampaignDB) -> Campaign:
+    return Campaign(
+        id=db.id,
+        name=db.name,
+        target_id=db.target_id,
+        window_seconds=db.window_seconds,
+        time_scale=db.time_scale,
+        plan=db.get_plan(),
+        status=db.status,
+        started_at=db.started_at,
+        completed_at=db.completed_at,
+        created_at=db.created_at,
+        summary=db.get_summary(),
+    )
+
+
 def _result_to_db(result: EvalResult) -> EvalResultDB:
     return EvalResultDB(
         id=result.id,
@@ -303,6 +340,7 @@ class RunRepository:
         existing.target_id = run.target_id
         existing.scenario_id = run.scenario_id
         existing.scenario_version = run.scenario_version
+        existing.campaign_id = run.campaign_id
         existing.status = run.status.value
         existing.triggered_by = run.triggered_by.value
         existing.completed_at = run.completed_at
@@ -331,6 +369,28 @@ class RunRepository:
         return True
 
 
+class CampaignRepository:
+    """Repository for evaluation campaigns (评估活动)."""
+
+    def __init__(self, session: Optional[Session] = None):
+        self.session = session or get_session()
+
+    def list_all(self) -> list[Campaign]:
+        statement = select(CampaignDB).order_by(CampaignDB.created_at.desc())
+        return [_campaign_from_db(r) for r in self.session.exec(statement).all()]
+
+    def get(self, campaign_id: str) -> Optional[Campaign]:
+        db = self.session.get(CampaignDB, campaign_id)
+        return _campaign_from_db(db) if db else None
+
+    def create(self, campaign: Campaign) -> Campaign:
+        db = _campaign_to_db(campaign)
+        self.session.add(db)
+        self.session.commit()
+        self.session.refresh(db)
+        return _campaign_from_db(db)
+
+
 class ResultRepository:
     """Repository for evaluation results."""
 
diff --git a/backend/agenteval/web/app.py b/backend/agenteval/web/app.py
index 3f17752..ada84e9 100644
--- a/backend/agenteval/web/app.py
+++ b/backend/agenteval/web/app.py
@@ -13,7 +13,7 @@ from agenteval.storage.db import get_session, init_db
 from agenteval.storage.repository import RunRepository
 from agenteval.version import get_build_info, get_version
 from agenteval.web.deps import require_api_key
-from agenteval.web.routers import auth, files, model_configs, proxy, reports, runs, scenarios, stats, targets
+from agenteval.web.routers import auth, campaigns, files, model_configs, proxy, reports, runs, scenarios, stats, targets
 from agenteval.web.websocket import ws_manager
 
 
@@ -58,6 +58,7 @@ app.include_router(auth.router, prefix="/api/auth", tags=["auth"])
 app.include_router(targets.router, prefix="/api/targets", tags=["targets"], dependencies=_api_deps)
 app.include_router(scenarios.router, prefix="/api/scenarios", tags=["scenarios"], dependencies=_api_deps)
 app.include_router(runs.router, prefix="/api/runs", tags=["runs"], dependencies=_api_deps)
+app.include_router(campaigns.router, prefix="/api/campaigns", tags=["campaigns"], dependencies=_api_deps)
 app.include_router(reports.router, prefix="/api/reports", tags=["reports"], dependencies=_api_deps)
 app.include_router(stats.router, prefix="/api/stats", tags=["stats"], dependencies=_api_deps)
 app.include_router(files.router, prefix="/api/files", tags=["files"], dependencies=_api_deps)
diff --git a/backend/agenteval/web/routers/campaigns.py b/backend/agenteval/web/routers/campaigns.py
new file mode 100644
index 0000000..b473e1b
--- /dev/null
+++ b/backend/agenteval/web/routers/campaigns.py
@@ -0,0 +1,63 @@
+"""API routes for evaluation campaigns (评估活动).
+
+This ticket covers persistence and create/query only — no scheduling or child
+Run spawning. Those arrive in later tickets.
+"""
+
+from fastapi import APIRouter, Depends, HTTPException
+from pydantic import BaseModel, Field
+from sqlmodel import Session
+
+from agenteval.models import Campaign, CampaignPlanEntry
+from agenteval.storage.repository import CampaignRepository, ScenarioRepository, TargetRepository
+from agenteval.web.deps import get_db
+
+router = APIRouter()
+
+
+class CreateCampaignRequest(BaseModel):
+    name: str
+    target_id: str
+    window_seconds: int = Field(gt=0)
+    time_scale: float = Field(default=1.0, gt=0)
+    plan: list[CampaignPlanEntry] = Field(min_length=1)
+
+
+@router.get("")
+async def list_campaigns(session: Session = Depends(get_db)) -> list[dict]:
+    return [c.model_dump() for c in CampaignRepository(session).list_all()]
+
+
+@router.post("")
+async def create_campaign(
+    request: CreateCampaignRequest,
+    session: Session = Depends(get_db),
+) -> dict:
+    if not TargetRepository(session).get(request.target_id):
+        raise HTTPException(status_code=404, detail="target not found")
+
+    scenario_repo = ScenarioRepository(session)
+    for entry in request.plan:
+        if not scenario_repo.get(entry.scenario_id):
+            raise HTTPException(
+                status_code=404,
+                detail=f"scenario not found: {entry.scenario_id}",
+            )
+
+    campaign = Campaign(
+        name=request.name,
+        target_id=request.target_id,
+        window_seconds=request.window_seconds,
+        time_scale=request.time_scale,
+        plan=request.plan,
+    )
+    campaign = CampaignRepository(session).create(campaign)
+    return campaign.model_dump()
+
+
+@router.get("/{campaign_id}")
+async def get_campaign(campaign_id: str, session: Session = Depends(get_db)) -> dict:
+    campaign = CampaignRepository(session).get(campaign_id)
+    if not campaign:
+        raise HTTPException(status_code=404, detail="campaign not found")
+    return campaign.model_dump()
diff --git a/migrations/env.py b/migrations/env.py
index cbf7f8e..19ac3d6 100644
--- a/migrations/env.py
+++ b/migrations/env.py
@@ -11,6 +11,7 @@ from alembic import context
 # Import the DB module so its SQLModel table classes register in metadata.
 from agenteval.storage.db import DATABASE_URL  # noqa: F401
 from agenteval.storage.db import (  # noqa: F401
+    CampaignDB,
     EvalResultDB,
     EvalRunDB,
     EvalTargetDB,
diff --git a/migrations/versions/e6c3d1a2f809_add_campaigns.py b/migrations/versions/e6c3d1a2f809_add_campaigns.py
new file mode 100644
index 0000000..f7a1118
--- /dev/null
+++ b/migrations/versions/e6c3d1a2f809_add_campaigns.py
@@ -0,0 +1,50 @@
+"""add campaigns table and eval_runs.campaign_id
+
+Revision ID: e6c3d1a2f809
+Revises: d5b8c2e4f617
+Create Date: 2026-07-29
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+import sqlmodel  # noqa: F401
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "e6c3d1a2f809"
+down_revision: Union[str, Sequence[str], None] = "d5b8c2e4f617"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "campaigns",
+        sa.Column("id", sqlmodel.sql.sqltypes.AutoString(), nullable=False),
+        sa.Column("name", sqlmodel.sql.sqltypes.AutoString(), nullable=False),
+        sa.Column("target_id", sqlmodel.sql.sqltypes.AutoString(), nullable=True),
+        sa.Column("window_seconds", sa.Integer(), nullable=False),
+        sa.Column("time_scale", sa.Float(), nullable=False),
+        sa.Column("plan", sqlmodel.sql.sqltypes.AutoString(), nullable=False),
+        sa.Column("status", sqlmodel.sql.sqltypes.AutoString(), nullable=False),
+        sa.Column("started_at", sa.DateTime(), nullable=True),
+        sa.Column("completed_at", sa.DateTime(), nullable=True),
+        sa.Column("created_at", sa.DateTime(), nullable=True),
+        sa.Column("summary", sqlmodel.sql.sqltypes.AutoString(), nullable=True),
+        sa.ForeignKeyConstraint(["target_id"], ["eval_targets.id"]),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    with op.batch_alter_table("eval_runs") as batch_op:
+        batch_op.add_column(
+            sa.Column("campaign_id", sqlmodel.sql.sqltypes.AutoString(), nullable=True)
+        )
+        batch_op.create_foreign_key(
+            "fk_eval_runs_campaign_id", "campaigns", ["campaign_id"], ["id"]
+        )
+
+
+def downgrade() -> None:
+    with op.batch_alter_table("eval_runs") as batch_op:
+        batch_op.drop_constraint("fk_eval_runs_campaign_id", type_="foreignkey")
+        batch_op.drop_column("campaign_id")
+    op.drop_table("campaigns")
diff --git a/tests/conftest.py b/tests/conftest.py
index a05c44f..53bb094 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -30,6 +30,7 @@ def db_session(tmp_db_path: Path) -> Session:
     """
     # Import DB models so their table=True declarations register in metadata.
     from agenteval.storage.db import (  # noqa: F401
+        CampaignDB,
         EvalResultDB,
         EvalRunDB,
         EvalTargetDB,
diff --git a/tests/integration/test_campaigns_api.py b/tests/integration/test_campaigns_api.py
new file mode 100644
index 0000000..29c676c
--- /dev/null
+++ b/tests/integration/test_campaigns_api.py
@@ -0,0 +1,179 @@
+"""Integration tests for the /api/campaigns endpoints.
+
+Uses ``httpx.AsyncClient`` with ``app=`` to drive the FastAPI app in-process
+(no real server). No scheduling or child-run spawning happens in this ticket —
+these tests cover persistence, create/query, validation, and that adding the
+nullable ``campaign_id`` column does not disturb existing Run behavior.
+"""
+
+import pytest
+from httpx import ASGITransport, AsyncClient
+
+from agenteval.models import (
+    Case, CaseType, ChannelType, EvalRun, EvalTarget, PlatformType,
+    Scenario, TargetStatus,
+)
+from agenteval.storage.repository import RunRepository, ScenarioRepository, TargetRepository
+from agenteval.web.app import app
+
+
+@pytest.fixture()
+def seeded_db(db_session, monkeypatch):
+    """Patch the global get_session to the test session and seed target + scenario."""
+    from agenteval.storage import db as db_module
+    from agenteval.storage import repository as repo_module
+    from agenteval.web import app as app_module
+
+    monkeypatch.setattr(app_module, "init_db", lambda: None)
+
+    def _test_get_session():
+        return db_session
+
+    monkeypatch.setattr(db_module, "get_session", _test_get_session)
+    monkeypatch.setattr(repo_module, "get_session", _test_get_session)
+
+    from agenteval.web.deps import get_db
+
+    def _test_get_db():
+        try:
+            yield db_session
+        finally:
+            pass
+
+    app.dependency_overrides[get_db] = _test_get_db
+
+    target = EvalTarget(
+        id="t-1", name="mock-target",
+        platform=PlatformType.AI_DIGITAL_EMPLOYEE,
+        channel_type=ChannelType.TUTU_API,
+        channel_config={"base_url": "http://mock", "token": "x"},
+        status=TargetStatus.ACTIVE,
+    )
+    TargetRepository(db_session).create(target)
+
+    scenario = Scenario(
+        id="s-1", name="mock-scenario",
+        cases=[Case(id="c1", type=CaseType.SINGLE, messages=["hi"])],
+    )
+    ScenarioRepository(db_session).create(scenario)
+
+    yield db_session
+
+    app.dependency_overrides.clear()
+
+
+@pytest.fixture()
+async def client():
+    transport = ASGITransport(app=app)
+    async with AsyncClient(transport=transport, base_url="http://test") as c:
+        yield c
+
+
+def _valid_payload(**overrides) -> dict:
+    payload = {
+        "name": "24h-cycle",
+        "target_id": "t-1",
+        "window_seconds": 86400,
+        "time_scale": 1.0,
+        "plan": [
+            {"scenario_id": "s-1", "offset_seconds": 0, "count": 2},
+            {"scenario_id": "s-1", "offset_seconds": 3600, "count": 1},
+        ],
+    }
+    payload.update(overrides)
+    return payload
+
+
+# ── list / create / get ──────────────────────────────────────────────────
+
+async def test_list_campaigns_empty(client, seeded_db):
+    resp = await client.get("/api/campaigns")
+    assert resp.status_code == 200
+    assert resp.json() == []
+
+
+async def test_create_campaign_then_get(client, seeded_db):
+    resp = await client.post("/api/campaigns", json=_valid_payload())
+    assert resp.status_code == 200
+    body = resp.json()
+    campaign_id = body["id"]
+    assert body["status"] == "planned"
+    assert body["name"] == "24h-cycle"
+    assert body["target_id"] == "t-1"
+    assert body["window_seconds"] == 86400
+    assert body["time_scale"] == 1.0
+    assert len(body["plan"]) == 2
+
+    got = (await client.get(f"/api/campaigns/{campaign_id}")).json()
+    assert got["id"] == campaign_id
+    assert got["status"] == "planned"
+    assert got["plan"][0]["scenario_id"] == "s-1"
+    assert got["plan"][0]["offset_seconds"] == 0
+    assert got["plan"][0]["count"] == 2
+    assert got["plan"][1]["offset_seconds"] == 3600
+
+
+async def test_create_campaign_default_time_scale(client, seeded_db):
+    payload = _valid_payload()
+    del payload["time_scale"]
+    resp = await client.post("/api/campaigns", json=payload)
+    assert resp.status_code == 200
+    assert resp.json()["time_scale"] == 1.0
+
+
+async def test_list_campaigns_after_create(client, seeded_db):
+    await client.post("/api/campaigns", json=_valid_payload())
+    listing = (await client.get("/api/campaigns")).json()
+    assert len(listing) == 1
+    assert listing[0]["name"] == "24h-cycle"
+
+
+async def test_get_campaign_not_found(client, seeded_db):
+    resp = await client.get("/api/campaigns/does-not-exist")
+    assert resp.status_code == 404
+
+
+# ── validation ─────────────────────────────────────────────────────────────
+
+async def test_create_campaign_empty_plan_rejected(client, seeded_db):
+    resp = await client.post("/api/campaigns", json=_valid_payload(plan=[]))
+    assert resp.status_code == 422
+
+
+async def test_create_campaign_missing_target_404(client, seeded_db):
+    resp = await client.post("/api/campaigns", json=_valid_payload(target_id="nope"))
+    assert resp.status_code == 404
+
+
+async def test_create_campaign_missing_scenario_404(client, seeded_db):
+    payload = _valid_payload(plan=[{"scenario_id": "nope", "offset_seconds": 0, "count": 1}])
+    resp = await client.post("/api/campaigns", json=payload)
+    assert resp.status_code == 404
+
+
+async def test_create_campaign_bad_window_rejected(client, seeded_db):
+    resp = await client.post("/api/campaigns", json=_valid_payload(window_seconds=0))
+    assert resp.status_code == 422
+
+
+async def test_create_campaign_bad_time_scale_rejected(client, seeded_db):
+    resp = await client.post("/api/campaigns", json=_valid_payload(time_scale=0))
+    assert resp.status_code == 422
+
+
+# ── campaign_id column does not break existing Run behavior ─────────────────
+
+async def test_run_campaign_id_defaults_none(seeded_db):
+    repo = RunRepository(seeded_db)
+    run = repo.create(EvalRun(target_id="t-1", scenario_id="s-1"))
+    assert run.campaign_id is None
+    fetched = repo.get(run.id)
+    assert fetched.campaign_id is None
+
+
+async def test_run_can_belong_to_campaign(seeded_db):
+    repo = RunRepository(seeded_db)
+    run = repo.create(EvalRun(target_id="t-1", scenario_id="s-1", campaign_id="camp-1"))
+    assert run.campaign_id == "camp-1"
+    fetched = repo.get(run.id)
+    assert fetched.campaign_id == "camp-1"