diff --git a/apps/api/app/api/routes/voices.py b/apps/api/app/api/routes/voices.py
index ed0a9f996..d03e7fa76 100755
--- a/apps/api/app/api/routes/voices.py
+++ b/apps/api/app/api/routes/voices.py
@@ -7,7 +7,6 @@ from __future__ import annotations
 
 import logging
 import time
-from concurrent.futures import ThreadPoolExecutor, as_completed
 from typing import Literal, Optional
 
 from app.api.routes._helpers import get_user_plan
@@ -97,23 +96,20 @@ def _resolve_all_preset_preview_urls(
     presets: list,
     cosyvoice: CosyVoiceService,
 ) -> dict[str, str]:
-    """并行解析所有预置音色的 preview_url.
+    """顺序解析所有预置音色的 preview_url.
+
+    采用顺序调用（而非并行）以避免触发 DashScope API 速率限制。
+    首次调用后结果缓存 7 天，后续请求直接命中缓存。
 
     Returns:
         voice_id -> preview_url 映射
     """
     result_map: dict[str, str] = {}
-    with ThreadPoolExecutor(max_workers=4) as executor:
-        future_to_voice = {
-            executor.submit(_resolve_preset_preview_url, p.voice_id, p.preview_url, cosyvoice): p.voice_id
-            for p in presets
-        }
-        for future in as_completed(future_to_voice):
-            vid = future_to_voice[future]
-            try:
-                result_map[vid] = future.result()
-            except Exception:
-                result_map[vid] = ""
+    for p in presets:
+        try:
+            result_map[p.voice_id] = _resolve_preset_preview_url(p.voice_id, p.preview_url, cosyvoice)
+        except Exception:
+            result_map[p.voice_id] = p.preview_url
     return result_map