diff --git a/app.py b/app.py
index f884b47..0c57700 100644
--- a/app.py
+++ b/app.py
@@ -1560,7 +1560,12 @@ def api_contract_profile():
 @require_nav("fees")
 def fees():
     from trading_context import get_trading_mode
-    from ctp_fee_worker import try_daily_ctp_fee_sync, get_fee_last_sync, fees_synced_today
+    from ctp_fee_worker import (
+        schedule_ctp_fee_sync,
+        get_fee_last_sync,
+        fees_synced_today,
+        fee_sync_in_progress,
+    )
     from vnpy_bridge import ctp_status
 
     mode = get_trading_mode(get_setting)
@@ -1568,7 +1573,7 @@ def fees():
         action = request.form.get("action")
         if action == "sync_ctp":
             force = request.form.get("force") == "1"
-            count, msg = try_daily_ctp_fee_sync(
+            _, msg = schedule_ctp_fee_sync(
                 mode,
                 get_setting=get_setting,
                 set_setting=set_setting,
@@ -1586,6 +1591,7 @@ def fees():
         fee_counts=fee_counts,
         fee_last_sync=get_fee_last_sync(get_setting),
         fee_synced_today=fees_synced_today(get_setting),
+        fee_sync_running=fee_sync_in_progress(),
         ctp_connected=bool(ctp_st.get("connected")),
     )
 
diff --git a/ctp_fee_worker.py b/ctp_fee_worker.py
index 1ff36f1..2f6ce98 100644
--- a/ctp_fee_worker.py
+++ b/ctp_fee_worker.py
@@ -16,6 +16,10 @@ CHECK_INTERVAL_SEC = 3600
 _sync_lock = threading.Lock()
 
 
+def fee_sync_in_progress() -> bool:
+    return _sync_lock.locked()
+
+
 def _today_str() -> str:
     return datetime.now(TZ).date().isoformat()
 
@@ -48,17 +52,49 @@ def try_daily_ctp_fee_sync(
         if not force and fees_synced_today(get_setting):
             return 0, "今日已从 CTP 同步过"
 
+        t0 = time.monotonic()
         from ctp_fee_sync import sync_fees_from_ctp
 
         count, msg = sync_fees_from_ctp(mode)
+        elapsed = time.monotonic() - t0
         if count > 0:
             mark_fees_synced(set_setting)
+            msg = f"{msg}（耗时 {elapsed:.1f} 秒）"
             logger.info("CTP 手续费每日同步: %s", msg)
         elif force:
+            msg = f"{msg}（耗时 {elapsed:.1f} 秒）"
             logger.warning("CTP 手续费强制同步未写入: %s", msg)
         return count, msg
 
 
+def schedule_ctp_fee_sync(
+    mode: str,
+    *,
+    get_setting: Callable[[str, str], str],
+    set_setting: Callable[[str, str], None],
+    force: bool = False,
+) -> tuple[bool, str]:
+    """后台线程同步，避免阻塞 Web 请求。"""
+    if _sync_lock.locked():
+        return False, "手续费同步进行中，请稍后再试（约 1～3 分钟）"
+
+    def _run() -> None:
+        try:
+            try_daily_ctp_fee_sync(
+                mode,
+                get_setting=get_setting,
+                set_setting=set_setting,
+                force=force,
+            )
+        except Exception as exc:
+            logger.exception("CTP 手续费后台同步失败: %s", exc)
+
+    threading.Thread(target=_run, daemon=True, name="ctp-fee-sync-run").start()
+    if force:
+        return True, "已在后台开始同步，约 30 秒～2 分钟完成，请稍后刷新本页查看"
+    return True, "已在后台检查同步，请稍后刷新本页"
+
+
 def start_ctp_fee_worker(
     *,
     get_mode_fn: Callable[[], str],
diff --git a/templates/fees.html b/templates/fees.html
index f9db460..5c5fa06 100644
--- a/templates/fees.html
+++ b/templates/fees.html
@@ -34,6 +34,9 @@
         {% if fee_last_sync %}
         <span class="text-muted" style="font-size:.8rem">上次：{{ fee_last_sync[:16] }}</span>
         {% endif %}
+        {% if fee_sync_running %}
+        <span class="badge planned">同步中…</span>
+        {% endif %}
         {% if fee_counts.get('ctp') %}
         <span class="text-muted" style="font-size:.8rem">共 {{ fee_counts.ctp }} 个品种</span>
         {% endif %}