diff --git a/src/main/java/com/loafle/commons/rpc/protocol/json/JSONClientRequest.java b/src/main/java/com/loafle/commons/rpc/protocol/json/JSONClientRequest.java
index 875cbad..4eac3f9 100644
--- a/src/main/java/com/loafle/commons/rpc/protocol/json/JSONClientRequest.java
+++ b/src/main/java/com/loafle/commons/rpc/protocol/json/JSONClientRequest.java
@@ -1,7 +1,5 @@
 package com.loafle.commons.rpc.protocol.json;
 
-import java.util.List;
-
 import org.codehaus.jackson.annotate.JsonProperty;
 
 /**
@@ -11,13 +9,13 @@ public class JSONClientRequest {
   @JsonProperty("jsonrpc")
   public String version;
   public String method;
-  public Object[] params;
+  public Object params;
   public Object id;
 
-  JSONClientRequest(String version, String method, Object[] params, Object id) {
+  JSONClientRequest(String version, String method, Object params, Object id) {
     this.version = version;
     this.method = method;
     this.params = params;
     this.id = id;
   }
-}
\ No newline at end of file
+}
diff --git a/src/main/java/com/loafle/commons/rpc/protocol/json/JSONRPCClientCodec.java b/src/main/java/com/loafle/commons/rpc/protocol/json/JSONRPCClientCodec.java
index e50b06d..763b99f 100644
--- a/src/main/java/com/loafle/commons/rpc/protocol/json/JSONRPCClientCodec.java
+++ b/src/main/java/com/loafle/commons/rpc/protocol/json/JSONRPCClientCodec.java
@@ -1,6 +1,7 @@
 package com.loafle.commons.rpc.protocol.json;
 
 import java.io.IOException;
+import java.util.List;
 
 import com.loafle.commons.rpc.RPCException;
 import com.loafle.commons.rpc.protocol.RPCClientCodec;
@@ -21,7 +22,8 @@ public class JSONRPCClientCodec extends JSONRPCCodec implements RPCClientCodec {
 
 	@Override
 	public byte[] request(String method, Object[] params, Object id) throws RPCException {
-    JSONClientRequest request = new JSONClientRequest(JSONRPC.version, method, params, id);
+    List<String> _params = JSONUtil.convertParamsToStringArray(objectMapper, params);
+    JSONClientRequest request = new JSONClientRequest(JSONRPC.version, method, _params, id);
 
     try {
       String json = this.objectMapper.writeValueAsString(request);
diff --git a/src/main/java/com/loafle/commons/rpc/protocol/json/JSONUtil.java b/src/main/java/com/loafle/commons/rpc/protocol/json/JSONUtil.java
new file mode 100644
index 0000000..27097d1
--- /dev/null
+++ b/src/main/java/com/loafle/commons/rpc/protocol/json/JSONUtil.java
@@ -0,0 +1,38 @@
+package com.loafle.commons.rpc.protocol.json;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import com.google.gson.internal.Primitives;
+import com.loafle.commons.rpc.RPCException;
+
+import org.codehaus.jackson.map.ObjectMapper;
+
+/**
+ * JSONUtil
+ */
+public abstract class JSONUtil {
+  public static List<String> convertParamsToStringArray(ObjectMapper objectMapper, Object[] params)
+      throws RPCException {
+    List<String> values = new ArrayList<>();
+    if (null == params || 0 == params.length) {
+      return values;
+    }
+
+    try {
+      for (Object param : params) {
+        Class<?> clazz = param.getClass();
+        if (!Primitives.isPrimitive(clazz) && !clazz.equals(String.class)) {
+          values.add(objectMapper.writeValueAsString(param));
+        } else {
+          values.add(String.valueOf(param));
+        }
+      }
+    } catch (IOException e) {
+      throw new RPCException("cannot unmarsharling", e);
+    }
+
+    return values;
+  }
+}
\ No newline at end of file