diff --git a/service-forest/src/main/java/com/lanyuanxiaoyao/service/forest/service/PulsarService.java b/service-forest/src/main/java/com/lanyuanxiaoyao/service/forest/service/PulsarService.java
index 5ff5932..013f5ef 100644
--- a/service-forest/src/main/java/com/lanyuanxiaoyao/service/forest/service/PulsarService.java
+++ b/service-forest/src/main/java/com/lanyuanxiaoyao/service/forest/service/PulsarService.java
@@ -7,6 +7,7 @@ import com.lanyuanxiaoyao.service.configuration.entity.pulsar.PulsarNamespace;
 import com.lanyuanxiaoyao.service.configuration.entity.pulsar.PulsarTenant;
 import com.lanyuanxiaoyao.service.configuration.entity.pulsar.PulsarTopic;
 import org.eclipse.collections.api.list.ImmutableList;
+import org.springframework.web.bind.annotation.RequestParam;
 
 /**
  * Pulsar
@@ -33,4 +34,7 @@ public interface PulsarService {
 
     @Get("/topics")
     ImmutableList<PulsarTopic> topics(@Query("name") String name, @Query("namespace") String namespace);
+
+    @Get("/backlog")
+    Long backlog(@Query("name") String name, @Query("topic") String topic, @RequestParam("subscription") String subscription);
 }
diff --git a/service-pulsar-query/src/main/java/com/lanyuanxiaoyao/service/pulsar/PulsarQueryApplication.java b/service-pulsar-query/src/main/java/com/lanyuanxiaoyao/service/pulsar/PulsarQueryApplication.java
index 21d7efb..89f88c1 100644
--- a/service-pulsar-query/src/main/java/com/lanyuanxiaoyao/service/pulsar/PulsarQueryApplication.java
+++ b/service-pulsar-query/src/main/java/com/lanyuanxiaoyao/service/pulsar/PulsarQueryApplication.java
@@ -7,9 +7,6 @@ import com.lanyuanxiaoyao.service.configuration.entity.pulsar.PulsarInfo;
 import com.lanyuanxiaoyao.service.configuration.entity.pulsar.PulsarNamespace;
 import com.lanyuanxiaoyao.service.configuration.entity.pulsar.PulsarTenant;
 import com.lanyuanxiaoyao.service.configuration.entity.pulsar.PulsarTopic;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
 import org.apache.pulsar.client.admin.PulsarAdmin;
 import org.apache.pulsar.client.admin.PulsarAdminException;
 import org.apache.pulsar.client.api.MessageId;
@@ -29,6 +26,11 @@ import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
 /**
  * @author lanyuanxiaoyao
  * @date 2023-04-27
@@ -127,6 +129,20 @@ public class PulsarQueryApplication {
         }
     }
 
+    @RequestMapping("backlog")
+    public Long backlog(@RequestParam("name") String name, @RequestParam("topic") String topic, @RequestParam("subscription") String subscription) throws PulsarClientException, PulsarAdminException {
+        PulsarInfo info = getInfo(name);
+        try (PulsarAdmin admin = PulsarAdmin.builder()
+                .serviceHttpUrl(adminUrl(info))
+                .build()) {
+            Map<String, ? extends SubscriptionStats> subscriptions = admin.topics().getStats(topic).getSubscriptions();
+            if (ObjectUtil.isNotNull(subscriptions) && subscriptions.containsKey(subscription)) {
+                return subscriptions.get(subscription).getBacklogSize();
+            }
+            return -1L;
+        }
+    }
+
     private static PulsarTopic convert(PulsarAdmin admin, String topic) throws PulsarAdminException {
         TopicStats stats = admin.topics().getStats(topic);
         MessageId lastMessageId = admin.topics().getLastMessageId(topic);