diff --git a/rdagent/utils/env.py b/rdagent/utils/env.py
index 3f80d7c9..16f81c62 100644
--- a/rdagent/utils/env.py
+++ b/rdagent/utils/env.py
@@ -349,6 +349,7 @@ class DockerEnv(Env[DockerConf]):
             env = {}
         env["PYTHONWARNINGS"] = "ignore"
         env["TF_CPP_MIN_LOG_LEVEL"] = "2"
+        env["PYTHONUNBUFFERED"] = "1"
         client = docker.from_env()
 
         volumns = {}