diff --git a/interop/src/cangjie/DeserializerBase.cj b/interop/src/cangjie/DeserializerBase.cj
index 7e73e01bf7b33f6f4627eb1c9e23f7d3dbcf4c69..2ae92c8769bec6ffe11a5abd7988419c50731024 100644
--- a/interop/src/cangjie/DeserializerBase.cj
+++ b/interop/src/cangjie/DeserializerBase.cj
@@ -103,12 +103,12 @@ public open class DeserializerBase {
     // }
 
     public func readString(): String {
-        return "readString"
-        // let length = Int64(this.readInt32())
-        // this.checkCapacity(length)
-        // // read without null-terminated byte
-        // let value = InteropNativeModule._Utf8ToString(this.buffer, Int32(this.position), Int32(length))
-        // this.position += length
+        let length = Int64(this.readInt32())
+        this.checkCapacity(length)
+        // read without null-terminated byte
+        let value = InteropNativeModule._Utf8ToString(this.buffer.toArray(), Int32(this.position), Int32(length))
+        this.position += length
+        return value
     }
 
     public func readCustomObject(kind: String): Object{
diff --git a/interop/src/cangjie/InteropNativeModule.cj b/interop/src/cangjie/InteropNativeModule.cj
index 95b7d7414b10bac87222c69bf58ec62ec5174a22..5d46174980a2e358fc17807baa9a034b0c9fed53 100644
--- a/interop/src/cangjie/InteropNativeModule.cj
+++ b/interop/src/cangjie/InteropNativeModule.cj
@@ -144,9 +144,9 @@ public open class InteropNativeModule {
             LibC.free(str1)
         }
     }
-    public static func _Utf8ToString(data: ArrayList<UInt8>, offset: Int32, length: Int32): String {
+    public static func _Utf8ToString(data: Array<UInt8>, offset: Int32, length: Int32): String {
         unsafe {
-            let handle_0 = acquireArrayRawData(data.toArray())
+            let handle_0 = acquireArrayRawData(data)
             let result = Utf8ToString(handle_0.pointer, offset, length)
             releaseArrayRawData(handle_0)
             return result.toString()
diff --git a/interop/src/cpp/cangjie/convertors-cj.h b/interop/src/cpp/cangjie/convertors-cj.h
index 882405ac7a4cf414d7c15022109d4edb1a9d3a1b..cf83974d6bbdda26e13d38dcf56587b64adf11b8 100644
--- a/interop/src/cpp/cangjie/convertors-cj.h
+++ b/interop/src/cpp/cangjie/convertors-cj.h
@@ -765,7 +765,8 @@ KOALA_INTEROP_EXPORT Ret name(InteropTypeConverter<P0>::InteropType _p0,   \
 
 
 #define KOALA_INTEROP_CTX_3(name, Ret, P0, P1, P2)                         \
-KOALA_INTEROP_EXPORT Ret name(InteropTypeConverter<P0>::InteropType _p0,   \
+KOALA_INTEROP_EXPORT InteropTypeConverter<Ret>::InteropType name(          \
+                             InteropTypeConverter<P0>::InteropType _p0,    \
                             InteropTypeConverter<P1>::InteropType _p1,     \
                             InteropTypeConverter<P2>::InteropType _p2) {   \
     KOALA_MAYBE_LOG(name)                                                  \