diff --git a/lzy/execution-env/src/main/java/ai/lzy/env/aux/CondaEnvironment.java b/lzy/execution-env/src/main/java/ai/lzy/env/aux/CondaEnvironment.java
index 9a64c4190..b9021f647 100644
--- a/lzy/execution-env/src/main/java/ai/lzy/env/aux/CondaEnvironment.java
+++ b/lzy/execution-env/src/main/java/ai/lzy/env/aux/CondaEnvironment.java
@@ -189,6 +189,7 @@ private LzyProcess execInEnv(String command, @Nullable LogStream out) {
     public LzyProcess runProcess(String[] command, @Nullable String[] envp, @Nullable String workingDir) {
         List<String> envList = new ArrayList<>();
         envList.add("LOCAL_MODULES=" + baseEnvWorkingDir);
+        envList.add("PYTHONUNBUFFERED=1");
         if (envp != null) {
             envList.addAll(Arrays.asList(envp));
         }