diff --git a/pkg/controller.v1/paddlepaddle/envvar.go b/pkg/controller.v1/paddlepaddle/envvar.go
index ff5c29a592..2bcd379642 100644
--- a/pkg/controller.v1/paddlepaddle/envvar.go
+++ b/pkg/controller.v1/paddlepaddle/envvar.go
@@ -59,7 +59,7 @@ func setPodEnv(obj interface{}, podTemplateSpec *corev1.PodTemplateSpec, rtype,
 		// Ref https://stackoverflow.com/questions/59812009/what-is-the-use-of-pythonunbuffered-in-docker-file.
 		podTemplateSpec.Spec.Containers[i].Env = append(podTemplateSpec.Spec.Containers[i].Env, corev1.EnvVar{
 			Name:  "PYTHONUNBUFFERED",
-			Value: "0",
+			Value: "1",
 		})
 
 		podTemplateSpec.Spec.Containers[i].Env = append(podTemplateSpec.Spec.Containers[i].Env, corev1.EnvVar{
diff --git a/pkg/controller.v1/pytorch/envvar.go b/pkg/controller.v1/pytorch/envvar.go
index d3ff5880a7..808aa14f50 100644
--- a/pkg/controller.v1/pytorch/envvar.go
+++ b/pkg/controller.v1/pytorch/envvar.go
@@ -45,7 +45,7 @@ func setPodEnv(obj interface{}, podTemplateSpec *corev1.PodTemplateSpec, rtype,
 		podTemplateSpec.Spec.Containers[i].Env = append(
 			podTemplateSpec.Spec.Containers[i].Env, corev1.EnvVar{
 				Name:  "PYTHONUNBUFFERED",
-				Value: "0",
+				Value: "1",
 			})
 
 		// If the master is not null, then we need to set the MASTER_ADDR and RANK.
diff --git a/pkg/controller.v1/xgboost/xgboost.go b/pkg/controller.v1/xgboost/xgboost.go
index b8f9927aa7..1ac3378080 100644
--- a/pkg/controller.v1/xgboost/xgboost.go
+++ b/pkg/controller.v1/xgboost/xgboost.go
@@ -92,7 +92,7 @@ func SetPodEnv(job interface{}, podTemplate *corev1.PodTemplateSpec, rtype, inde
 		})
 		podTemplate.Spec.Containers[i].Env = append(podTemplate.Spec.Containers[i].Env, corev1.EnvVar{
 			Name:  "PYTHONUNBUFFERED",
-			Value: "0",
+			Value: "1",
 		})
 		// This variables are used if it is a LightGBM job
 		if totalReplicas > 1 {