diff --git a/joylive-plugin/joylive-router/joylive-router-grpc/src/main/java/com/jd/live/agent/plugin/router/gprc/request/GrpcRequest.java b/joylive-plugin/joylive-router/joylive-router-grpc/src/main/java/com/jd/live/agent/plugin/router/gprc/request/GrpcRequest.java
index 6e3776e72..4eeb1fce5 100644
--- a/joylive-plugin/joylive-router/joylive-router-grpc/src/main/java/com/jd/live/agent/plugin/router/gprc/request/GrpcRequest.java
+++ b/joylive-plugin/joylive-router/joylive-router-grpc/src/main/java/com/jd/live/agent/plugin/router/gprc/request/GrpcRequest.java
@@ -31,6 +31,9 @@
 
 import java.net.InetSocketAddress;
 import java.net.SocketAddress;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.StreamSupport;
 
 /**
  * An interface representing a gRPC request.
@@ -81,6 +84,21 @@ public void setHeader(String key, String value) {
             request.setHeader(key, value);
         }
 
+        @Override
+        public String getHeader(String key) {
+            return request.getHeaders().get(Metadata.Key.of(key, Metadata.ASCII_STRING_MARSHALLER));
+        }
+
+        @Override
+        public List<String> getHeaders(String key) {
+            Iterable<String> iterable = request.getHeaders().getAll(Metadata.Key.of(key, Metadata.ASCII_STRING_MARSHALLER));
+            if (iterable == null) {
+                return null;
+            }
+            return StreamSupport.stream(iterable.spliterator(), false)
+                    .collect(Collectors.toList());
+        }
+
         @SuppressWarnings("unchecked")
         @Override
         public <E extends Endpoint> E getEndpoint() {
diff --git a/joylive-plugin/joylive-transmission/joylive-transmission-grpc/src/main/java/com/jd/live/agent/plugin/transmission/grpc/interceptor/ClientCallImplInterceptor.java b/joylive-plugin/joylive-transmission/joylive-transmission-grpc/src/main/java/com/jd/live/agent/plugin/transmission/grpc/interceptor/ClientCallImplInterceptor.java
index c843c953c..35d27902a 100644
--- a/joylive-plugin/joylive-transmission/joylive-transmission-grpc/src/main/java/com/jd/live/agent/plugin/transmission/grpc/interceptor/ClientCallImplInterceptor.java
+++ b/joylive-plugin/joylive-transmission/joylive-transmission-grpc/src/main/java/com/jd/live/agent/plugin/transmission/grpc/interceptor/ClientCallImplInterceptor.java
@@ -28,7 +28,21 @@ public void onEnter(ExecutableContext ctx) {
     }
 
     private void attachTag(Metadata metadata) {
-        RequestContext.cargos(tag -> metadata.put(Metadata.Key.of(tag.getKey(), Metadata.ASCII_STRING_MARSHALLER), tag.getValue()));
+        RequestContext.cargos(tag -> {
+                    // If the tag key and value already exists in the metadata, do not add it again.
+                    if (metadata.containsKey(Metadata.Key.of(tag.getKey(), Metadata.ASCII_STRING_MARSHALLER))) {
+                        Iterable<String> iterable = metadata.getAll(Metadata.Key.of(tag.getKey(), Metadata.ASCII_STRING_MARSHALLER));
+                        if (iterable != null) {
+                            for (String value : iterable) {
+                                if (value.equals(tag.getValue())) {
+                                    return;
+                                }
+                            }
+                        }
+                    }
+                    metadata.put(Metadata.Key.of(tag.getKey(), Metadata.ASCII_STRING_MARSHALLER), tag.getValue());
+                }
+        );
     }
 
 }