diff --git a/src/agentscope/studio/_app.py b/src/agentscope/studio/_app.py
index 57c10a38b..5cc50c730 100644
--- a/src/agentscope/studio/_app.py
+++ b/src/agentscope/studio/_app.py
@@ -384,7 +384,7 @@ def _alloc_server() -> Response:
     if len(servers) == 0:
         return jsonify({"status": "fail"})
     server = choice(servers)
-    if not RpcClient(host=server.host, port=server.port).is_alive():
+    if RpcClient(host=server.host, port=server.port).is_alive():
         return jsonify(
             {
                 "host": server.host,