diff --git a/Jenkinsfile b/Jenkinsfile
index e1c9c2258..0660d219a 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -229,6 +229,14 @@ pipeline {
                         String service = selectedService
                         branches[service] = {
                             String jobName = "${env.RESOLVED_JOB_PREFIX}${service}"
+                            boolean deployBothBridges = service == 'event-bridge-service'
+                                && ['BOTH', 'SELECT'].contains(params.EVENT_BRIDGE_REGION)
+                            String downstreamImageTag = deployBothBridges
+                                ? "${env.IMAGE_TAG}-both"
+                                : env.IMAGE_TAG
+                            String downstreamBridgeRegion = deployBothBridges
+                                ? 'CN'
+                                : params.EVENT_BRIDGE_REGION
                             echo "触发单服务 Job: ${jobName}"
                             def downstreamBuild = build(
                                 job: jobName,
@@ -236,17 +244,16 @@ pipeline {
                                 propagate: false,
                                 parameters: [
                                     string(name: 'SOURCE_COMMIT', value: env.SOURCE_COMMIT),
-                                    string(name: 'IMAGE_TAG', value: env.IMAGE_TAG),
+                                    string(name: 'IMAGE_TAG', value: downstreamImageTag),
                                     string(name: 'ENVIRONMENT', value: env.RESOLVED_ENVIRONMENT),
                                     booleanParam(name: 'DEPLOY', value: params.DEPLOY),
                                     // 总控已完成统一测试，或用户已明确选择跳过；下游仅负责编译、打包和部署。
                                     booleanParam(name: 'SKIP_TESTS', value: true),
                                     string(name: 'IMAGE_REPOSITORY', value: env.RESOLVED_IMAGE_REPOSITORY),
                                     string(name: 'DOCKER_BASE_IMAGE', value: params.DOCKER_BASE_IMAGE),
-                                    // 旧下游 Job 的 ChoiceParameterDefinition 尚不接受 BOTH；
-                                    // 使用兼容值 SELECT 传递，下游新流水线会将其解释为双区域部署。
-                                    string(name: 'EVENT_BRIDGE_REGION', value:
-                                        params.EVENT_BRIDGE_REGION == 'BOTH' ? 'SELECT' : params.EVENT_BRIDGE_REGION)
+                                    // Choice 参数始终传递所有新旧 Job 都接受的单区值；
+                                    // 双区意图通过现有 IMAGE_TAG 参数携带，由下游还原真实镜像标签。
+                                    string(name: 'EVENT_BRIDGE_REGION', value: downstreamBridgeRegion)
                                 ]
                             )
                             downstreamResults[service] = downstreamBuild.result ?: 'UNKNOWN'
diff --git a/Jenkinsfile.service b/Jenkinsfile.service
index fcdf1cbff..a1aed8754 100644
--- a/Jenkinsfile.service
+++ b/Jenkinsfile.service
@@ -76,6 +76,11 @@ pipeline {
                             if (!serviceModules.contains(service)) {
                                 error("无法从 Job 名称 ${env.JOB_BASE_NAME} 识别服务；名称必须以以下服务之一结尾: ${serviceModules.join(', ')}")
                             }
+                            boolean deployBothBridges = service == 'event-bridge-service'
+                                && imageTag?.endsWith('-both')
+                            if (deployBothBridges) {
+                                imageTag = imageTag.substring(0, imageTag.length() - '-both'.length())
+                            }
                             if (!sourceCommit || !(sourceCommit ==~ /(?i)[0-9a-f]{7,40}/)) {
                                 error('SOURCE_COMMIT 必须是 7 到 40 位十六进制 Git commit')
                             }
@@ -93,13 +98,14 @@ pipeline {
                             env.RESOLVED_SOURCE_COMMIT = sourceCommit
                             env.RESOLVED_IMAGE_TAG = imageTag
                             env.RESOLVED_IMAGE_REPOSITORY = imageRepository
+                            env.DEPLOY_BOTH_EVENT_BRIDGES = deployBothBridges ? 'true' : 'false'
 
                             if (service == 'event-bridge-service' && params.DEPLOY) {
                                 String bridgeRegion = params.EVENT_BRIDGE_REGION?.trim()
                                 if (!['BOTH', 'SELECT', 'CN', 'OVERSEAS'].contains(bridgeRegion)) {
                                     error('EVENT_BRIDGE_REGION 只能为 BOTH、CN 或 OVERSEAS')
                                 }
-                                if (['BOTH', 'SELECT'].contains(bridgeRegion)
+                                if ((deployBothBridges || ['BOTH', 'SELECT'].contains(bridgeRegion))
                                     && !['development', 'test'].contains(params.ENVIRONMENT)) {
                                     error('事件桥 BOTH 仅支持开发或测试环境；预发布和生产必须明确选择 CN 或 OVERSEAS')
                                 }
@@ -197,7 +203,8 @@ pipeline {
                                 unstash 'deployment-files'
                                 echo "在目标节点 ${env.NODE_NAME} 本机部署到 ${params.ENVIRONMENT}"
                                 List bridgeRegions = env.RESOLVED_SERVICE == 'event-bridge-service'
-                                    && ['BOTH', 'SELECT'].contains(params.EVENT_BRIDGE_REGION)
+                                    && (env.DEPLOY_BOTH_EVENT_BRIDGES == 'true'
+                                        || ['BOTH', 'SELECT'].contains(params.EVENT_BRIDGE_REGION))
                                     ? ['CN', 'OVERSEAS']
                                     : [params.EVENT_BRIDGE_REGION]
                                 withCredentials([
diff --git a/scripts/controller-pipeline-contract.test.mjs b/scripts/controller-pipeline-contract.test.mjs
index 04d4a4303..65be87496 100644
--- a/scripts/controller-pipeline-contract.test.mjs
+++ b/scripts/controller-pipeline-contract.test.mjs
@@ -46,5 +46,7 @@ test('coordinator defaults event bridge deployments to both non-production regio
   assert.match(pipeline, /\['BOTH', 'SELECT', 'CN', 'OVERSEAS'\]\.contains\(bridgeRegion\)/)
   assert.match(pipeline, /兼容旧 Jenkins 参数 SELECT：本次按 BOTH/)
   assert.match(pipeline, /事件桥 BOTH 仅支持开发或测试环境/)
-  assert.match(pipeline, /params\.EVENT_BRIDGE_REGION == 'BOTH' \? 'SELECT' : params\.EVENT_BRIDGE_REGION/)
+  assert.match(pipeline, /String downstreamImageTag = deployBothBridges[\s\S]*?\? "\$\{env\.IMAGE_TAG\}-both"/)
+  assert.match(pipeline, /String downstreamBridgeRegion = deployBothBridges[\s\S]*?\? 'CN'/)
+  assert.match(pipeline, /string\(name: 'EVENT_BRIDGE_REGION', value: downstreamBridgeRegion\)/)
 })
diff --git a/scripts/test-environment-pipeline-contract.test.mjs b/scripts/test-environment-pipeline-contract.test.mjs
index d7897f09b..9858d6992 100644
--- a/scripts/test-environment-pipeline-contract.test.mjs
+++ b/scripts/test-environment-pipeline-contract.test.mjs
@@ -163,4 +163,7 @@ test('one event bridge build deploys both regional instances in development and
   assert.match(pipeline, /bridgeRegions\.each \{ bridgeRegion ->/)
   assert.match(pipeline, /EVENT_BRIDGE_REGION_OVERRIDE=\$\{bridgeRegion\}/)
   assert.match(pipeline, /部署事件桥实例:/)
+  assert.match(pipeline, /imageTag\?\.endsWith\('-both'\)/)
+  assert.match(pipeline, /imageTag\.substring\(0, imageTag\.length\(\) - '-both'\.length\(\)\)/)
+  assert.match(pipeline, /env\.DEPLOY_BOTH_EVENT_BRIDGES = deployBothBridges \? 'true' : 'false'/)
 })