diff --git a/src/api/handlers/base/base_handler.py b/src/api/handlers/base/base_handler.py
index cf673fb..87de1b3 100644
--- a/src/api/handlers/base/base_handler.py
+++ b/src/api/handlers/base/base_handler.py
@@ -423,6 +423,13 @@ class BaseMessageHandler:
         provider = ctx.provider_name
         target_model = ctx.mapped_model
 
+        # 如果 provider 为空，记录警告（不应该发生，但用于调试）
+        if not provider:
+            logger.warning(
+                f"[{target_request_id}] 更新 streaming 状态时 provider 为空: "
+                f"ctx.provider_name={ctx.provider_name}, ctx.provider_id={ctx.provider_id}"
+            )
+
         async def _do_update() -> None:
             try:
                 db_gen = get_db()
diff --git a/src/api/handlers/base/cli_handler_base.py b/src/api/handlers/base/cli_handler_base.py
index eb189e8..5f0f081 100644
--- a/src/api/handlers/base/cli_handler_base.py
+++ b/src/api/handlers/base/cli_handler_base.py
@@ -834,6 +834,7 @@ class CliMessageHandlerBase(BaseMessageHandler):
             last_data_time = time.time()
             buffer = b""
             first_yield = True  # 标记是否是第一次 yield
+            streaming_status_updated = False  # 标记状态是否已更新
             # 使用增量解码器处理跨 chunk 的 UTF-8 字符
             decoder = codecs.getincrementaldecoder("utf-8")(errors="replace")
 
@@ -843,6 +844,7 @@ class CliMessageHandlerBase(BaseMessageHandler):
             # 在第一次输出数据前更新状态为 streaming
             if prefetched_chunks:
                 self._update_usage_to_streaming_with_ctx(ctx)
+                streaming_status_updated = True
 
             # 先处理预读的字节块
             for chunk in prefetched_chunks:
@@ -907,6 +909,11 @@ class CliMessageHandlerBase(BaseMessageHandler):
 
             # 继续处理剩余的流数据（使用同一个迭代器）
             async for chunk in byte_iterator:
+                # 如果预读数据为空，在收到第一个 chunk 时更新状态
+                if not streaming_status_updated:
+                    self._update_usage_to_streaming_with_ctx(ctx)
+                    streaming_status_updated = True
+
                 buffer += chunk
                 # 处理缓冲区中的完整行
                 while b"\n" in buffer:
diff --git a/src/services/usage/service.py b/src/services/usage/service.py
index d2e9ac9..bdb2628 100644
--- a/src/services/usage/service.py
+++ b/src/services/usage/service.py
@@ -1503,6 +1503,12 @@ class UsageService:
             usage.error_message = error_message
         if provider:
             usage.provider = provider
+        elif status == "streaming" and usage.provider == "pending":
+            # 状态变为 streaming 但 provider 仍为 pending，记录警告
+            logger.warning(
+                f"状态更新为 streaming 但 provider 为空: request_id={request_id}, "
+                f"当前 provider={usage.provider}"
+            )
         if target_model:
             usage.target_model = target_model
         if first_byte_time_ms is not None: