diff --git a/apps/em/cd.py b/apps/em/cd.py
index f6b97ca4..70a4ec77 100644
--- a/apps/em/cd.py
+++ b/apps/em/cd.py
@@ -64,9 +64,10 @@ def get_tyy_data(*args):
     cd_thread_key = f"cd_thread_{host}_{port}"
     cd_thread_val = cache.get(cd_thread_key, default=None)
     if cd_thread_val is None:
-        cache.set(cd_thread_key, "get")
+        cache.set(cd_thread_key, "start")
         cd_thread = MyThread(target=get_tyy_data_t, args=(host, port), daemon=True)
         cd_thread.start()
+    cache.set(cd_thread_key, "get")
     num = 0
     while True:
         num += 1