diff --git a/pipeline_llm/gateway.py b/pipeline_llm/gateway.py
index f55e9a7..7d2ad33 100644
--- a/pipeline_llm/gateway.py
+++ b/pipeline_llm/gateway.py
@@ -199,7 +199,7 @@ async def _model_chain(sor, org_id: str, model_name: str, purpose: str = ''):
     for mid in chain_ids:
         recs = await sor.sqlExe(
             "SELECT id, name, vendor_id, vendor_model_id, capability, default_params, "
-            "ppid, org_id, profile_id, sync_mode, query_profile_ids "
+            "ppid, org_id, profile_id, sync_mode, query_profile_ids, account_id "
             "FROM llm_model WHERE id=${i}$ AND status='active' LIMIT 1", {"i": mid})
         await sor.sqlExe("COMMIT", {})
         if recs:
@@ -223,10 +223,20 @@ async def _vendor_endpoints(sor, vendor_id: str):
 
 
 async def _account_candidates(sor, model: dict):
-    """模型的候选账号池：同供应商、启用中。"""
+    """模型的候选账号池：同供应商、启用中。
+
+    模型配置了 account_id 时（如某模型只允许用某个账号充值/密钥），
+    候选池收窄为该账号——模型级账号绑定优先于供应商级轮转。
+    """
+    where = "vendor_id=${v}$ AND status='active'"
+    params = {"v": model.get('vendor_id', '')}
+    bound = (model.get('account_id') or '').strip()
+    if bound:
+        where += " AND id=${a}$"
+        params['a'] = bound
     recs = await sor.sqlExe(
         "SELECT id, name, api_key, endpoint_ids, balance, status FROM llm_account "
-        "WHERE vendor_id=${v}$ AND status='active'", {"v": model.get('vendor_id', '')})
+        "WHERE " + where, params)
     await sor.sqlExe("COMMIT", {})
     return [_row_to_dict(r) for r in (recs or [])]