diff --git a/dubbo-common/src/main/java/org/apache/dubbo/rpc/model/MethodDescriptor.java b/dubbo-common/src/main/java/org/apache/dubbo/rpc/model/MethodDescriptor.java
index 2496d2dea31..77f87ede4ae 100644
--- a/dubbo-common/src/main/java/org/apache/dubbo/rpc/model/MethodDescriptor.java
+++ b/dubbo-common/src/main/java/org/apache/dubbo/rpc/model/MethodDescriptor.java
@@ -51,6 +51,10 @@ public interface MethodDescriptor {
 
     Object getAttribute(String key);
 
+    Class<?>[] getActualRequestTypes();
+
+    Class<?> getActualResponseType();
+
     enum RpcType {
         UNARY,
         CLIENT_STREAM,
diff --git a/dubbo-common/src/main/java/org/apache/dubbo/rpc/model/ReflectionMethodDescriptor.java b/dubbo-common/src/main/java/org/apache/dubbo/rpc/model/ReflectionMethodDescriptor.java
index 7d4fd1208aa..ac0778d601a 100644
--- a/dubbo-common/src/main/java/org/apache/dubbo/rpc/model/ReflectionMethodDescriptor.java
+++ b/dubbo-common/src/main/java/org/apache/dubbo/rpc/model/ReflectionMethodDescriptor.java
@@ -99,12 +99,17 @@ private RpcType determineRpcType() {
         boolean returnIsVoid = returnClass.getName().equals(void.class.getName());
         if (returnIsVoid && parameterClasses.length == 1 && isStreamType(parameterClasses[0])) {
             actualRequestTypes = Collections.emptyList().toArray(new Class<?>[0]);
+            actualResponseType = obtainActualTypeInStreamObserver(
+                    ((ParameterizedType) method.getGenericParameterTypes()[0]).getActualTypeArguments()[0]);
             return RpcType.SERVER_STREAM;
         }
         if (returnIsVoid
                 && parameterClasses.length == 2
                 && !isStreamType(parameterClasses[0])
                 && isStreamType(parameterClasses[1])) {
+            actualRequestTypes = parameterClasses;
+            actualResponseType = obtainActualTypeInStreamObserver(
+                    ((ParameterizedType) method.getGenericParameterTypes()[1]).getActualTypeArguments()[0]);
             return RpcType.SERVER_STREAM;
         }
         if (Arrays.stream(parameterClasses).anyMatch(this::isStreamType) || isStreamType(returnClass)) {
@@ -119,13 +124,6 @@ private boolean isStreamType(Class<?> classType) {
         return StreamObserver.class.isAssignableFrom(classType);
     }
 
-    private static Class<?> obtainActualTypeInStreamObserver(Type typeInStreamObserver) {
-        return (Class<?>)
-                (typeInStreamObserver instanceof ParameterizedType
-                        ? ((ParameterizedType) typeInStreamObserver).getRawType()
-                        : typeInStreamObserver);
-    }
-
     @Override
     public String getMethodName() {
         return methodName;
@@ -179,14 +177,23 @@ public Object getAttribute(String key) {
         return this.attributeMap.get(key);
     }
 
+    @Override
     public Class<?>[] getActualRequestTypes() {
         return actualRequestTypes;
     }
 
+    @Override
     public Class<?> getActualResponseType() {
         return actualResponseType;
     }
 
+    private Class<?> obtainActualTypeInStreamObserver(Type typeInStreamObserver) {
+        return (Class<?>)
+                (typeInStreamObserver instanceof ParameterizedType
+                        ? ((ParameterizedType) typeInStreamObserver).getRawType()
+                        : typeInStreamObserver);
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) {
diff --git a/dubbo-common/src/main/java/org/apache/dubbo/rpc/model/StubMethodDescriptor.java b/dubbo-common/src/main/java/org/apache/dubbo/rpc/model/StubMethodDescriptor.java
index 784c93e12bc..2e0c3f84a7e 100644
--- a/dubbo-common/src/main/java/org/apache/dubbo/rpc/model/StubMethodDescriptor.java
+++ b/dubbo-common/src/main/java/org/apache/dubbo/rpc/model/StubMethodDescriptor.java
@@ -119,6 +119,16 @@ public Object getAttribute(String key) {
         return this.attributeMap.get(key);
     }
 
+    @Override
+    public Class<?>[] getActualRequestTypes() {
+        return this.parameterClasses;
+    }
+
+    @Override
+    public Class<?> getActualResponseType() {
+        return this.returnClass;
+    }
+
     @Override
     public Pack getRequestPack() {
         return requestPack;
diff --git a/dubbo-rpc/dubbo-rpc-triple/src/main/java/org/apache/dubbo/rpc/protocol/tri/ReflectionPackableMethod.java b/dubbo-rpc/dubbo-rpc-triple/src/main/java/org/apache/dubbo/rpc/protocol/tri/ReflectionPackableMethod.java
index 8fc8867a438..4fd388d3362 100644
--- a/dubbo-rpc/dubbo-rpc-triple/src/main/java/org/apache/dubbo/rpc/protocol/tri/ReflectionPackableMethod.java
+++ b/dubbo-rpc/dubbo-rpc-triple/src/main/java/org/apache/dubbo/rpc/protocol/tri/ReflectionPackableMethod.java
@@ -73,19 +73,9 @@ public ReflectionPackableMethod(
         switch (method.getRpcType()) {
             case CLIENT_STREAM:
             case BI_STREAM:
-                actualRequestTypes = new Class<?>[] {
-                    obtainActualTypeInStreamObserver(
-                            ((ParameterizedType) method.getMethod().getGenericReturnType()).getActualTypeArguments()[0])
-                };
-                actualResponseType = obtainActualTypeInStreamObserver(
-                        ((ParameterizedType) method.getMethod().getGenericParameterTypes()[0])
-                                .getActualTypeArguments()[0]);
-                break;
             case SERVER_STREAM:
-                actualRequestTypes = method.getMethod().getParameterTypes();
-                actualResponseType = obtainActualTypeInStreamObserver(
-                        ((ParameterizedType) method.getMethod().getGenericParameterTypes()[1])
-                                .getActualTypeArguments()[0]);
+                actualRequestTypes = method.getActualRequestTypes();
+                actualResponseType = method.getActualResponseType();
                 break;
             case UNARY:
                 actualRequestTypes = method.getParameterClasses();
@@ -411,6 +401,9 @@ public byte[] pack(Object obj) throws IOException {
             for (String type : argumentsType) {
                 builder.addArgTypes(type);
             }
+            if (actualRequestTypes == null || actualRequestTypes.length == 0) {
+                return builder.build().toByteArray();
+            }
             ByteArrayOutputStream bos = new ByteArrayOutputStream();
             for (int i = 0; i < arguments.length; i++) {
                 Object argument = arguments[i];
diff --git a/dubbo-rpc/dubbo-rpc-triple/src/main/java/org/apache/dubbo/rpc/protocol/tri/TripleInvoker.java b/dubbo-rpc/dubbo-rpc-triple/src/main/java/org/apache/dubbo/rpc/protocol/tri/TripleInvoker.java
index 6a26fbc32f2..278524e4acc 100644
--- a/dubbo-rpc/dubbo-rpc-triple/src/main/java/org/apache/dubbo/rpc/protocol/tri/TripleInvoker.java
+++ b/dubbo-rpc/dubbo-rpc-triple/src/main/java/org/apache/dubbo/rpc/protocol/tri/TripleInvoker.java
@@ -207,10 +207,20 @@ private static boolean isSync(MethodDescriptor methodDescriptor, Invocation invo
 
     AsyncRpcResult invokeServerStream(MethodDescriptor methodDescriptor, Invocation invocation, ClientCall call) {
         RequestMetadata request = createRequest(methodDescriptor, invocation, null);
-        StreamObserver<Object> responseObserver =
-                (StreamObserver<Object>) invocation.getArguments()[1];
-        final StreamObserver<Object> requestObserver = streamCall(call, request, responseObserver);
-        requestObserver.onNext(invocation.getArguments()[0]);
+        Object[] arguments = invocation.getArguments();
+        final StreamObserver<Object> requestObserver;
+        if (arguments.length == 2) {
+            StreamObserver<Object> responseObserver = (StreamObserver<Object>) arguments[1];
+            requestObserver = streamCall(call, request, responseObserver);
+            requestObserver.onNext(invocation.getArguments()[0]);
+        } else if (arguments.length == 1) {
+            StreamObserver<Object> responseObserver = (StreamObserver<Object>) arguments[0];
+            requestObserver = streamCall(call, request, responseObserver);
+            requestObserver.onNext(null);
+        } else {
+            throw new IllegalStateException(
+                    "The first parameter must be a StreamObserver when there are no parameters, or the second parameter must be a StreamObserver when there are parameters");
+        }
         requestObserver.onCompleted();
         return new AsyncRpcResult(CompletableFuture.completedFuture(new AppResponse()), invocation);
     }