diff --git a/Jenkinsfile b/Jenkinsfile
index b8084642e..a06ba1017 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -236,7 +236,7 @@ pipeline {
                                 : env.IMAGE_TAG
                             String downstreamBridgeRegion = deployBothBridges
                                 ? 'CN'
-                                : params.EVENT_BRIDGE_REGION
+                                : (service == 'event-bridge-service' ? params.EVENT_BRIDGE_REGION : 'CN')
                             echo "触发单服务 Job: ${jobName}"
                             def downstreamBuild = build(
                                 job: jobName,
diff --git a/scripts/controller-pipeline-contract.test.mjs b/scripts/controller-pipeline-contract.test.mjs
index 2248b09e6..9ee3dd23c 100644
--- a/scripts/controller-pipeline-contract.test.mjs
+++ b/scripts/controller-pipeline-contract.test.mjs
@@ -49,5 +49,6 @@ test('coordinator defaults event bridge deployments to both non-production regio
   assert.match(pipeline, /事件桥 BOTH 仅支持开发或测试环境/)
   assert.match(pipeline, /String downstreamImageTag = deployBothBridges[\s\S]*?\? "\$\{env\.IMAGE_TAG\}-both"/)
   assert.match(pipeline, /String downstreamBridgeRegion = deployBothBridges[\s\S]*?\? 'CN'/)
+  assert.match(pipeline, /service == 'event-bridge-service' \? params\.EVENT_BRIDGE_REGION : 'CN'/)
   assert.match(pipeline, /string\(name: 'EVENT_BRIDGE_REGION', value: downstreamBridgeRegion\)/)
 })