diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6c35b2ebb..ed793d58e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,3 +13,4 @@
 - fix:fix ipv6 instance not found bug.
 - fix:fix tsf lossless not working bug.
 - fix:fix RestTemplate trace attribute loss bug.
+- fix:fix polaris_namespace is null when using TSF.
diff --git a/spring-cloud-tencent-polaris-context/src/main/java/com/tencent/cloud/polaris/context/config/extend/tsf/TsfCoreEnvironmentPostProcessor.java b/spring-cloud-tencent-polaris-context/src/main/java/com/tencent/cloud/polaris/context/config/extend/tsf/TsfCoreEnvironmentPostProcessor.java
index d50aa11fb..75a609102 100644
--- a/spring-cloud-tencent-polaris-context/src/main/java/com/tencent/cloud/polaris/context/config/extend/tsf/TsfCoreEnvironmentPostProcessor.java
+++ b/spring-cloud-tencent-polaris-context/src/main/java/com/tencent/cloud/polaris/context/config/extend/tsf/TsfCoreEnvironmentPostProcessor.java
@@ -119,6 +119,10 @@ public final class TsfCoreEnvironmentPostProcessor implements EnvironmentPostPro
 				if (StringUtils.isBlank(tsfNamespaceId)) {
 					LOGGER.error("tsf_namespace_id is empty");
 				}
+				String polarisNamespace = environment.getProperty("polaris_namespace");
+				if (StringUtils.isBlank(polarisNamespace) && StringUtils.isNotBlank(tsfNamespaceId)) {
+					defaultProperties.put("spring.cloud.polaris.namespace", tsfNamespaceId);
+				}
 
 				// context
 				defaultProperties.put("spring.cloud.polaris.enabled", "true");