diff --git a/src/backend/job-tools/k8s-startup-controller/src/main/java/com/tencent/bk/job/k8s/Consts.java b/src/backend/job-tools/k8s-startup-controller/src/main/java/com/tencent/bk/job/k8s/Consts.java
index ce4d209308..b541180b9c 100644
--- a/src/backend/job-tools/k8s-startup-controller/src/main/java/com/tencent/bk/job/k8s/Consts.java
+++ b/src/backend/job-tools/k8s-startup-controller/src/main/java/com/tencent/bk/job/k8s/Consts.java
@@ -27,6 +27,8 @@
 public class Consts {
     // k8s命名空间
     public static final String KEY_KUBERNETES_NAMESPACE = "KUBERNETES_NAMESPACE";
+    // k8s默认命名空间
+    public static final String VALUE_NAMESPACE_DEFAULT = "default";
     // 服务启动依赖关系定义字符串
     public static final String KEY_STARTUP_DEPENDENCIES_STR = "BK_JOB_STARTUP_DEPENDENCIES_STR";
     // 当前服务名称
diff --git a/src/backend/job-tools/k8s-startup-controller/src/main/java/com/tencent/bk/job/k8s/ServiceDependModel.java b/src/backend/job-tools/k8s-startup-controller/src/main/java/com/tencent/bk/job/k8s/ServiceDependModel.java
index 04567f2b2d..198f6c7d5b 100644
--- a/src/backend/job-tools/k8s-startup-controller/src/main/java/com/tencent/bk/job/k8s/ServiceDependModel.java
+++ b/src/backend/job-tools/k8s-startup-controller/src/main/java/com/tencent/bk/job/k8s/ServiceDependModel.java
@@ -30,7 +30,7 @@
 @Data
 public class ServiceDependModel {
     @Parameter(names = {"-n", "--namespace"}, description = "当前服务所在的命名空间")
-    private String namespace = "default";
+    private String namespace;
 
     @Parameter(names = {"-s", "--service"}, description = "当前服务名称")
     private String serviceName;
diff --git a/src/backend/job-tools/k8s-startup-controller/src/main/java/com/tencent/bk/job/k8s/StartupController.java b/src/backend/job-tools/k8s-startup-controller/src/main/java/com/tencent/bk/job/k8s/StartupController.java
index 856fd9a26a..d264f5d0a6 100644
--- a/src/backend/job-tools/k8s-startup-controller/src/main/java/com/tencent/bk/job/k8s/StartupController.java
+++ b/src/backend/job-tools/k8s-startup-controller/src/main/java/com/tencent/bk/job/k8s/StartupController.java
@@ -139,6 +139,10 @@ static ServiceDependModel parseDependModelFromArgsOrEnv(String[] args) {
                 Consts.KEY_KUBERNETES_NAMESPACE,
                 namespace
             );
+            if (StringUtils.isBlank(namespace)) {
+                namespace = Consts.VALUE_NAMESPACE_DEFAULT;
+                log.warn("use default namespace:{}", namespace);
+            }
             serviceDependModel.setNamespace(namespace);
         }
         String serviceName = serviceDependModel.getServiceName();