diff --git a/lastleg-service/src/main/java/com/baiyue/lastleg/client/EventBridgeClient.java b/lastleg-service/src/main/java/com/baiyue/lastleg/client/EventBridgeClient.java
index e6ab0d6fa..5a09c0bc4 100644
--- a/lastleg-service/src/main/java/com/baiyue/lastleg/client/EventBridgeClient.java
+++ b/lastleg-service/src/main/java/com/baiyue/lastleg/client/EventBridgeClient.java
@@ -9,7 +9,7 @@ import org.springframework.web.bind.annotation.RequestHeader;
 
 /** 将海外业务 Outbox 投递到国内区域事件桥。 */
 @FeignClient(name = "event-bridge-service", contextId = "overseasContainerEventBridgeClient",
-    url = "${baiyue.firstleg.event-bridge-url:}")
+    url = "${CN_EVENT_BRIDGE_URL:${baiyue.firstleg.event-bridge-url:}}")
 public interface EventBridgeClient {
     @PostMapping("/internal/event-bridge/events")
     ApiResponse<Acknowledgement> receive(
diff --git a/lastleg-service/src/main/resources/application.yml b/lastleg-service/src/main/resources/application.yml
index d9e11b65c..1aa3d7f34 100644
--- a/lastleg-service/src/main/resources/application.yml
+++ b/lastleg-service/src/main/resources/application.yml
@@ -50,7 +50,7 @@ baiyue:
     event-bridge:
       url: ${CN_EVENT_BRIDGE_URL:${FIRSTLEG_EVENT_BRIDGE_URL:}}
   firstleg:
-    event-bridge-url: ${FIRSTLEG_EVENT_BRIDGE_URL:}
+    event-bridge-url: ${CN_EVENT_BRIDGE_URL:${FIRSTLEG_EVENT_BRIDGE_URL:}}
     outbox-relay:
       fixed-delay-ms: ${FIRSTLEG_OUTBOX_RELAY_FIXED_DELAY_MS:5000}
       lease-seconds: ${FIRSTLEG_OUTBOX_RELAY_LEASE_SECONDS:60}
diff --git a/lastleg-service/src/test/java/com/baiyue/lastleg/client/EventBridgeClientContractTest.java b/lastleg-service/src/test/java/com/baiyue/lastleg/client/EventBridgeClientContractTest.java
new file mode 100644
index 000000000..5891459d7
--- /dev/null
+++ b/lastleg-service/src/test/java/com/baiyue/lastleg/client/EventBridgeClientContractTest.java
@@ -0,0 +1,16 @@
+package com.baiyue.lastleg.client;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.cloud.openfeign.FeignClient;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class EventBridgeClientContractTest {
+    @Test
+    void canonicalDomesticBridgeEnvironmentOverridesLegacyNacosProperty() {
+        FeignClient contract = EventBridgeClient.class.getAnnotation(FeignClient.class);
+
+        assertThat(contract.url())
+            .isEqualTo("${CN_EVENT_BRIDGE_URL:${baiyue.firstleg.event-bridge-url:}}");
+    }
+}