diff --git a/app/api/v1/ad.py b/app/api/v1/ad.py
index 57fcd19..e4441d3 100644
--- a/app/api/v1/ad.py
+++ b/app/api/v1/ad.py
@@ -84,12 +84,14 @@ def pangle_callback(request: Request, db: DbSession) -> PangleCallbackOut:
 
 @router.get("/reward-status", response_model=AdRewardStatusOut, summary="今日看广告发奖进度")
 def reward_status(user: CurrentUser, db: DbSession) -> AdRewardStatusOut:
-    used, limit, coin_per = crud_ad.today_status(db, user.id)
+    used, limit, coin_per, round_count, cooldown_until = crud_ad.today_status(db, user.id)
     return AdRewardStatusOut(
         used_today=used,
         daily_limit=limit,
         remaining=max(0, limit - used),
         coin_per_ad=coin_per,
+        round_count=round_count,
+        cooldown_until=cooldown_until,
     )
 
 
@@ -118,7 +120,7 @@ def test_grant(user: CurrentUser, db: DbSession) -> TestGrantOut:
     except crud_ad.UnknownUserError as e:
         raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="user not found") from e
 
-    used, limit, coin_per = crud_ad.today_status(db, user.id)
+    used, limit, coin_per, round_count, cooldown_until = crud_ad.today_status(db, user.id)
     logger.info("ad TEST grant user_id=%d status=%s coin=%d", user.id, rec.status, rec.coin)
     return TestGrantOut(
         granted=(rec.status == "granted"),
@@ -128,4 +130,6 @@ def test_grant(user: CurrentUser, db: DbSession) -> TestGrantOut:
         daily_limit=limit,
         remaining=max(0, limit - used),
         coin_per_ad=coin_per,
+        round_count=round_count,
+        cooldown_until=cooldown_until,
     )
diff --git a/app/core/rewards.py b/app/core/rewards.py
index ff98e65..4b2b6b2 100644
--- a/app/core/rewards.py
+++ b/app/core/rewards.py
@@ -59,16 +59,22 @@ TASK_REWARDS: dict[str, int] = {
 
 
 # ===== 看激励视频发金币(穿山甲 S2S 服务端回调发奖)=====
-# 看完一个激励视频发的金币(≈¥0.01,汇率 10000 金币=1 元)。
-# 作用:① 回调缺/坏 reward_amount 时的回退值;② 客户端进度接口展示的"单次预告金币"。
+# 看完一个激励视频发的金币(100 金币 ≈¥0.01,汇率 10000 金币=1 元)。
+# 作用:① 回调缺/坏 reward_amount 时的回退值;② 客户端进度接口展示的"单次预告金币";
+#       ③ test-grant 本地联调的发奖额。
 # 真实发放以穿山甲回调带回的 reward_amount 为准(见 resolve_ad_reward_coin),后台应把
-# 代码位"奖励数量"配成与本值一致(如 100),保证"广告内展示 / 进度预告 / 实际到账"三者一致。
+# 代码位"奖励数量"配成与本值一致(=100),保证"广告内展示 / 进度预告 / 实际到账"三者一致。
 AD_REWARD_COIN: int = 100
 # 单次发奖金币上限:夹紧穿山甲回调里异常的 reward_amount(如后台多打一个 0),防刷爆余额。
 MAX_AD_REWARD_COIN: int = 1000
 # 每用户每日发奖次数上限,防刷 + 控成本。
-# ⚠️ 占位值:正式上线前按产品策略 + 广告 eCPM 实测收益重新核定,改这里即可。
-DAILY_AD_REWARD_LIMIT: int = 10
+# ⚠️ 测试阶段值=20:正式上线前按产品策略 + 广告 eCPM 实测收益重新核定,改这里即可。
+DAILY_AD_REWARD_LIMIT: int = 20
+# 一轮看 N 次激励视频,看完一轮强制 10 分钟冷却(reward-status 派生 cooldown_until 给客户端,
+# 客户端任务行 CTA 在冷却期间显示"MM:SS"且不可点)。冷却是 UX 约束,后端发奖只看 daily_limit,
+# 冷却期间穿山甲回调仍照常发奖,不另设拒发分支。
+VIDEO_ROUND_REQUIRED_COUNT: int = 3
+VIDEO_ROUND_COOLDOWN_SECONDS: int = 600
 
 
 def resolve_ad_reward_coin(reward_amount: str | int | None) -> int:
diff --git a/app/repositories/ad_reward.py b/app/repositories/ad_reward.py
index bb7d008..a901443 100644
--- a/app/repositories/ad_reward.py
+++ b/app/repositories/ad_reward.py
@@ -10,11 +10,19 @@
 """
 from __future__ import annotations
 
+from datetime import datetime, timedelta, timezone
+
 from sqlalchemy import func, select
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.orm import Session
 
-from app.core.rewards import AD_REWARD_COIN, DAILY_AD_REWARD_LIMIT, cn_today
+from app.core.rewards import (
+    AD_REWARD_COIN,
+    DAILY_AD_REWARD_LIMIT,
+    VIDEO_ROUND_COOLDOWN_SECONDS,
+    VIDEO_ROUND_REQUIRED_COUNT,
+    cn_today,
+)
 from app.repositories import wallet as crud_wallet
 from app.models.ad_reward import AdRewardRecord
 from app.models.user import User
@@ -102,7 +110,49 @@ def _commit_record(db: Session, rec: AdRewardRecord, trans_id: str) -> AdRewardR
     return rec
 
 
-def today_status(db: Session, user_id: int) -> tuple[int, int, int]:
-    """客户端查"今日看广告发奖"进度:返回 (今日已发次数, 每日上限, 单次金币)。"""
-    used = _granted_today(db, user_id, cn_today().isoformat())
-    return used, DAILY_AD_REWARD_LIMIT, AD_REWARD_COIN
+def _last_completed_round_end_at(
+    db: Session, user_id: int, reward_date: str, round_count: int
+) -> datetime | None:
+    """当日 granted 记录中**最近一个已完成轮**末尾那次的 created_at。
+
+    思路:把当日 granted 按时间倒序排,跳过当前未完成轮的 round_count 条,下一条
+    即"上一轮最后一次"。round_count==0 且 used>=N 时跳 0 条直接取最近一条。
+    used<N(还没完成第一轮)调用方应直接判 None,不进这里。
+    """
+    return db.execute(
+        select(AdRewardRecord.created_at)
+        .where(
+            AdRewardRecord.user_id == user_id,
+            AdRewardRecord.reward_date == reward_date,
+            AdRewardRecord.status == "granted",
+        )
+        .order_by(AdRewardRecord.created_at.desc())
+        .offset(round_count)
+        .limit(1)
+    ).scalar_one_or_none()
+
+
+def today_status(
+    db: Session, user_id: int
+) -> tuple[int, int, int, int, datetime | None]:
+    """客户端查"今日看广告发奖"进度。
+
+    返回 (今日已发次数, 每日上限, 单次金币, 本轮已看次数, 本轮冷却结束时间(UTC))。
+    - round_count = used % VIDEO_ROUND_REQUIRED_COUNT,展示用(0..N-1)
+    - cooldown_until 计算:取最近一个已完成轮末尾的 created_at + 10 min;若仍 > now 则返回,
+      否则返回 None。冷却 = UX 约束(客户端 CTA 倒计时不可点),后端发奖逻辑不受影响。
+    """
+    today = cn_today().isoformat()
+    used = _granted_today(db, user_id, today)
+    round_count = used % VIDEO_ROUND_REQUIRED_COUNT
+    cooldown_until: datetime | None = None
+    if used >= VIDEO_ROUND_REQUIRED_COUNT:
+        last_end = _last_completed_round_end_at(db, user_id, today, round_count)
+        if last_end is not None:
+            # SQLAlchemy 在 SQLite 上拿到的 created_at 可能是 naive,统一按 UTC 解读再比较
+            if last_end.tzinfo is None:
+                last_end = last_end.replace(tzinfo=timezone.utc)
+            cd_end = last_end + timedelta(seconds=VIDEO_ROUND_COOLDOWN_SECONDS)
+            if cd_end > datetime.now(timezone.utc):
+                cooldown_until = cd_end
+    return used, DAILY_AD_REWARD_LIMIT, AD_REWARD_COIN, round_count, cooldown_until
diff --git a/app/schemas/ad.py b/app/schemas/ad.py
index 83d960b..47635e9 100644
--- a/app/schemas/ad.py
+++ b/app/schemas/ad.py
@@ -4,6 +4,8 @@
 """
 from __future__ import annotations
 
+from datetime import datetime
+
 from pydantic import BaseModel, Field
 
 
@@ -27,6 +29,14 @@ class AdRewardStatusOut(BaseModel):
     daily_limit: int = Field(..., description="每日发奖次数上限")
     remaining: int = Field(..., description="今日剩余可领次数")
     coin_per_ad: int = Field(..., description="看完一个激励视频发的金币")
+    round_count: int = Field(
+        ..., description="本轮(3 次一组)已看次数,0..N-1。客户端可由它判断'刚刚看完一轮'"
+    )
+    cooldown_until: datetime | None = Field(
+        None,
+        description="本轮看完后 10 分钟冷却结束时间(UTC ISO),null 表示不在冷却。"
+        "冷却是 UX 约束,后端发奖不受影响,客户端 CTA 据此显示 MM:SS 倒计时且不可点",
+    )
 
 
 class TestGrantOut(BaseModel):
@@ -39,3 +49,7 @@ class TestGrantOut(BaseModel):
     daily_limit: int = Field(..., description="每日发奖次数上限")
     remaining: int = Field(..., description="今日剩余可领次数")
     coin_per_ad: int = Field(..., description="看完一个激励视频发的金币")
+    round_count: int = Field(..., description="本轮已看次数,详见 AdRewardStatusOut")
+    cooldown_until: datetime | None = Field(
+        None, description="本轮冷却结束时间(UTC),详见 AdRewardStatusOut"
+    )
diff --git a/docs/api/ad-reward-status.md b/docs/api/ad-reward-status.md
index 7cd7e2d..5486edc 100644
--- a/docs/api/ad-reward-status.md
+++ b/docs/api/ad-reward-status.md
@@ -14,6 +14,15 @@
 | `daily_limit` | int | 每日发奖次数上限 |
 | `remaining` | int | 今日剩余可领次数 |
 | `coin_per_ad` | int | 看完一个激励视频发的金币 |
+| `round_count` | int | 本轮(3 次一组)已看次数,0..N-1。客户端可据「拿到 round_count==0 && cooldown_until!=null」判定刚刚看完一轮 |
+| `cooldown_until` | datetime\|null | 本轮 10 分钟冷却结束时间(UTC ISO);null 表示不在冷却 |
 
 ## 说明
-福利页「看视频赚金币」用:展示「今日还能看 N 次」「看一次得 M 金币」。真正发奖走 [ad-pangle-callback](./ad-pangle-callback.md)（穿山甲 S2S）。
+福利页「看视频赚金币」用:
+- 展示「今日还能看 N 次」「看一次得 M 金币」(`remaining`/`coin_per_ad`)
+- 任务行 CTA 4 态推导:`adLoading` → Loading;`remaining==0` → Capped("明天再来");`cooldown_until` 在未来 → CoolingDown(显示 MM:SS 倒计时,不可点);否则 Normal("去赚取")
+- 弹窗 limit note:`used_today >= daily_limit` 显示「今日视频已到限额，明天再来」;`round_count==0 && cooldown_until!=null` 显示「本轮视频已看完，10分钟后再来」
+
+冷却派生算法:取当日 `status='granted'` 记录里**最近一个已完成轮**(每 N=3 条算一轮)末尾那次的 `created_at`,加 10 分钟。若仍 > now → 返回;否则返回 null。**冷却是 UX 约束**,后端发奖(`/api/v1/ad/pangle-callback`)只看 daily_limit,冷却期间穿山甲回调照常发奖。
+
+真正发奖走 [ad-pangle-callback](./ad-pangle-callback.md)(穿山甲 S2S)。
diff --git a/tests/test_ad_reward.py b/tests/test_ad_reward.py
index ff1d00c..516df34 100644
--- a/tests/test_ad_reward.py
+++ b/tests/test_ad_reward.py
@@ -9,8 +9,15 @@ from sqlalchemy import select
 
 from app.core.config import settings
 from app.integrations import pangle
-from app.core.rewards import AD_REWARD_COIN, DAILY_AD_REWARD_LIMIT, MAX_AD_REWARD_COIN
+from app.core.rewards import (
+    AD_REWARD_COIN,
+    DAILY_AD_REWARD_LIMIT,
+    MAX_AD_REWARD_COIN,
+    VIDEO_ROUND_COOLDOWN_SECONDS,
+    VIDEO_ROUND_REQUIRED_COUNT,
+)
 from app.db.session import SessionLocal
+from app.models.ad_reward import AdRewardRecord
 from app.models.user import User
 
 
@@ -148,6 +155,81 @@ def test_reward_status_requires_auth(client) -> None:
     assert r.status_code == 401
 
 
+def test_reward_status_initial_round_state(client) -> None:
+    """新用户没看广告 → round_count=0, cooldown_until=None。"""
+    phone = "13800003101"
+    token = _login(client, phone)
+    st = client.get("/api/v1/ad/reward-status", headers=_auth(token)).json()
+    assert st["used_today"] == 0
+    assert st["round_count"] == 0
+    assert st["cooldown_until"] is None
+
+
+def test_reward_status_mid_round(client) -> None:
+    """看 1 次(未到一轮)→ round_count=1, cooldown_until 仍 None。"""
+    phone = "13800003102"
+    token = _login(client, phone)
+    uid = _user_id(phone)
+    _callback(client, _signed(uid, "trans_mid_1"))
+    st = client.get("/api/v1/ad/reward-status", headers=_auth(token)).json()
+    assert st["used_today"] == 1
+    assert st["round_count"] == 1
+    assert st["cooldown_until"] is None
+
+
+def test_reward_status_round_complete_enters_cooldown(client) -> None:
+    """刚看完一轮 N 次 → round_count=0(下一轮起点) + cooldown_until 是未来 ~10 分钟。"""
+    from datetime import datetime, timezone
+
+    phone = "13800003103"
+    token = _login(client, phone)
+    uid = _user_id(phone)
+    for i in range(VIDEO_ROUND_REQUIRED_COUNT):
+        _callback(client, _signed(uid, f"trans_rc_{i}"))
+
+    st = client.get("/api/v1/ad/reward-status", headers=_auth(token)).json()
+    assert st["used_today"] == VIDEO_ROUND_REQUIRED_COUNT
+    assert st["round_count"] == 0
+    assert st["cooldown_until"] is not None
+    cd = datetime.fromisoformat(st["cooldown_until"].replace("Z", "+00:00"))
+    if cd.tzinfo is None:
+        cd = cd.replace(tzinfo=timezone.utc)
+    now = datetime.now(timezone.utc)
+    delta = (cd - now).total_seconds()
+    # 配置 600s,允许 ±30s 容差(本机 / CI 慢 IO)
+    assert 0 < delta <= VIDEO_ROUND_COOLDOWN_SECONDS + 30
+
+
+def test_reward_status_cooldown_expired(client) -> None:
+    """看完一轮后冷却已过(手动改 created_at 到 11 分钟前)→ cooldown_until 回到 None。"""
+    from datetime import datetime, timedelta, timezone
+    from sqlalchemy import select, update
+
+    phone = "13800003104"
+    token = _login(client, phone)
+    uid = _user_id(phone)
+    for i in range(VIDEO_ROUND_REQUIRED_COUNT):
+        _callback(client, _signed(uid, f"trans_exp_{i}"))
+
+    # 把当日所有 granted 记录的 created_at 推到 11 分钟前(覆盖冷却末尾那条)
+    db = SessionLocal()
+    try:
+        eleven_min_ago = datetime.now(timezone.utc) - timedelta(seconds=VIDEO_ROUND_COOLDOWN_SECONDS + 60)
+        db.execute(
+            update(AdRewardRecord)
+            .where(AdRewardRecord.user_id == uid)
+            .values(created_at=eleven_min_ago)
+        )
+        db.commit()
+    finally:
+        db.close()
+
+    st = client.get("/api/v1/ad/reward-status", headers=_auth(token)).json()
+    assert st["used_today"] == VIDEO_ROUND_REQUIRED_COUNT
+    assert st["round_count"] == 0
+    assert st["cooldown_until"] is None
+
+
 def test_callback_disabled_returns_503(client, monkeypatch) -> None:
     """未配置回调(开关关)时 → 503。"""
     monkeypatch.setattr(settings, "PANGLE_CALLBACK_ENABLED", False)