diff --git a/reaction_board/web/queries.py b/reaction_board/web/queries.py
index 68f17cd..23937e1 100644
--- a/reaction_board/web/queries.py
+++ b/reaction_board/web/queries.py
@@ -699,7 +699,7 @@ class DashboardQueries:
         sort: str = "heat",
         within_days: int | None = None,
         year: int | None = None,
-        growth_days: int | str = 7,
+        growth_days: int | str = "auto",
         folder_id: int | None = None,
         q: str | None = None,
         page: int = 1,
@@ -734,7 +734,7 @@ class DashboardQueries:
         sort: str = "heat",
         within_days: int | None = None,
         year: int | None = None,
-        growth_days: int | str = 7,
+        growth_days: int | str = "auto",
         folder_id: int | None = None,
         q: str | None = None,
         page: int = 1,
@@ -742,24 +742,29 @@ class DashboardQueries:
     ) -> dict[str, Any]:
         if sort not in VIDEO_SORTS:
             raise ValueError(f"不支持的排序: {sort}")
+        # auto：仅增长类排序由服务端选窗（配置 home_growth_days；默认先 7 再降 1）。
+        # 首页应省略 growth_days，勿自行探查。其它排序把 auto 当作 7（兼容旧默认）。
         if growth_days == "auto":
-            preferred = self.config_store.get().analytics.home_growth_days
-            if preferred in (1, 7):
-                growth_days = int(preferred)
+            if sort in {"growth", "growth_rate"}:
+                preferred = self.config_store.get().analytics.home_growth_days
+                if preferred in (1, 7):
+                    growth_days = int(preferred)
+                else:
+                    trial = self._list_videos_uncached(
+                        sort=sort,
+                        within_days=within_days,
+                        year=year,
+                        growth_days=7,
+                        folder_id=folder_id,
+                        q=q,
+                        page=page,
+                        page_size=page_size,
+                    )
+                    if trial.get("available") and int(trial.get("total") or 0) > 0:
+                        return trial
+                    growth_days = 1
             else:
-                trial = self._list_videos_uncached(
-                    sort=sort,
-                    within_days=within_days,
-                    year=year,
-                    growth_days=7,
-                    folder_id=folder_id,
-                    q=q,
-                    page=page,
-                    page_size=page_size,
-                )
-                if trial.get("available") and int(trial.get("total") or 0) > 0:
-                    return trial
-                growth_days = 1
+                growth_days = 7
         growth_days = int(growth_days)
         if growth_days < 1 or growth_days > 365:
             raise ValueError("growth_days 必须在 1~365 之间")
@@ -942,6 +947,8 @@ class DashboardQueries:
                 "within_days": within_days,
                 "year": year,
                 "growth_days": growth_days,
+                # days：与 growth_days 同步；首页 auto 时为 1|7，供前端链接/展示
+                "days": growth_days,
                 "page": page,
                 "page_size": page_size,
                 "total": total,
diff --git a/reaction_board/web/server.py b/reaction_board/web/server.py
index 45dc580..ba8f3f6 100644
--- a/reaction_board/web/server.py
+++ b/reaction_board/web/server.py
@@ -650,11 +650,10 @@ def _year_param(query: Mapping[str, list[str]]) -> int | None:
 
 
 def _growth_days_param(query: Mapping[str, list[str]]) -> int | str:
-    """榜单传 1~365；首页可传 auto（由查询层按 home_growth_days 解析）。"""
+    """省略或 auto：查询层按 home_growth_days 解析（默认 7→1）。
+    榜单应显式传 1~365。"""
     raw = _optional_str(query, "growth_days")
-    if raw is None:
-        return 7
-    if raw == "auto":
+    if raw is None or raw == "auto":
         return "auto"
     try:
         value = int(raw)
diff --git a/reaction_board/web/static/views/home.js b/reaction_board/web/static/views/home.js
index 714215f..05acf2a 100644
--- a/reaction_board/web/static/views/home.js
+++ b/reaction_board/web/static/views/home.js
@@ -47,8 +47,8 @@ export async function renderHome(root) {
     api("/api/overview"),
     api("/api/videos", { sort: "published", within_days: 14, limit: 6 }),
     api("/api/videos", { sort: "heat", limit: 6 }),
-    // auto：服务端按 analytics.home_growth_days 解析；默认先试 7 天再降到 1 天
-    api("/api/videos", { sort: "growth", growth_days: "auto", limit: 6 }),
+    // 不带天数：后端按 home_growth_days（默认 auto：有 7 日则 7，否则 1）决定，响应带 days
+    api("/api/videos", { sort: "growth", limit: 6 }),
   ]);
 
   const fans = overview.fans;
@@ -60,7 +60,8 @@ export async function renderHome(root) {
   const pending = overview.counts?.candidates_pending || 0;
   // 候选提示仅对已登录（或未启用鉴权）用户可见，访客不展示运行期信息。
   const showCandidates = pending > 0 && canAccessProtected();
-  const growthDays = Number(growth.growth_days) || 1;
+  // 以后端返回的 days（与 growth_days 同步）为准，避免前端再探查
+  const growthDays = Number(growth.days ?? growth.growth_days) || 1;
   const growthLabel = `近 ${growthDays} 日`;
   const growthEmptyTitle = growth.reason
     || `近 ${growthDays} 日增长暂不可用`;
diff --git a/tests/test_web_queries.py b/tests/test_web_queries.py
index a5e1ca1..f157eb3 100644
--- a/tests/test_web_queries.py
+++ b/tests/test_web_queries.py
@@ -106,6 +106,8 @@ def test_growth_and_cold_start():
         try:
             growth = q.list_videos(sort="growth", growth_days=2)
             assert growth["available"] is True
+            assert growth["days"] == 2
+            assert growth["growth_days"] == 2
             assert {item["aid"] for item in growth["items"]} == {101, 102}
             first = next(item for item in growth["items"] if item["aid"] == 101)
             assert first["growth"]["available"] is True
@@ -570,15 +572,19 @@ def test_growth_auto_falls_back_to_one_day():
     with tempfile.TemporaryDirectory() as tmp:
         db, q = setup(tmp)
         try:
-            auto = q.list_videos(sort="growth", growth_days="auto", page_size=6)
+            # 省略 growth_days 与显式 auto 等价：后端决定窗口并回传 days
+            auto = q.list_videos(sort="growth", page_size=6)
             assert auto["available"] is True
             assert auto["growth_days"] == 1
+            assert auto["days"] == 1
             assert {item["aid"] for item in auto["items"]} == {101, 102}
             first = next(item for item in auto["items"] if item["aid"] == 101)
             assert first["growth"]["delta"] == 100  # 相邻日
 
             forced7 = q.list_videos(sort="growth", growth_days=7)
             assert forced7["available"] is False
+            assert forced7["days"] == 7
+            assert forced7["growth_days"] == 7
             assert "至少 8 天快照" in forced7["reason"]
 
             # 配置钉死 7 天：auto 不再降级
@@ -589,8 +595,9 @@ def test_growth_auto_falls_back_to_one_day():
             target = max(path.stat().st_mtime_ns, time.time_ns()) + 1_000_000
             os.utime(path, ns=(target, target))
             DASHBOARD_CACHE.clear()
-            pinned = q.list_videos(sort="growth", growth_days="auto")
+            pinned = q.list_videos(sort="growth")  # omit → auto → 配置钉死 7
             assert pinned["growth_days"] == 7
+            assert pinned["days"] == 7
             assert pinned["available"] is False
         finally:
             db.close()
diff --git a/tests/test_web_server.py b/tests/test_web_server.py
index 5d53fd2..cfb8872 100644
--- a/tests/test_web_server.py
+++ b/tests/test_web_server.py
@@ -108,8 +108,11 @@ def test_readonly_routes_and_static():
 
             status, _, payload = running.request("/api/videos")
             assert status == 200
-            items = json.loads(payload)["data"]["items"]
+            heat_payload = json.loads(payload)["data"]
+            items = heat_payload["items"]
             assert items and items[0]["aid"] == 102
+            # 非增长排序：省略 growth_days 时 days/growth_days 回落为 7，不做 7→1
+            assert heat_payload["days"] == heat_payload["growth_days"] == 7
 
             status, _, payload = running.json("/api/videos?year=2026")
             assert status == 200
@@ -120,6 +123,13 @@ def test_readonly_routes_and_static():
             assert status == 200
             assert payload["data"]["year"] == 2026
 
+            # 首页形态：省略 growth_days → 后端 auto，响应带 days/growth_days
+            status, _, payload = running.json("/api/videos?sort=growth&limit=6")
+            assert status == 200
+            growth = payload["data"]
+            assert growth["days"] == growth["growth_days"] == 1
+            assert growth["available"] is True
+
             status, _, payload = running.request("/api/ups")
             assert status == 200
             assert json.loads(payload)["data"]["sort"] == "efficiency"