diff --git a/src/Neo.Cryptography.BLS12_381/GObject.cs b/src/Neo.Cryptography.BLS12_381/GObject.cs
index bafebb4..c719239 100644
--- a/src/Neo.Cryptography.BLS12_381/GObject.cs
+++ b/src/Neo.Cryptography.BLS12_381/GObject.cs
@@ -34,20 +34,8 @@ public GObject(byte[] g)
         {
             try
             {
-                switch (type)
-                {
-                    case GType.G1:
-                        Interop.g1_dispose(ptr);
-                        break;
-                    case GType.G2:
-                        Interop.g2_dispose(ptr);
-                        break;
-                    case GType.Gt:
-                        Interop.gt_dispose(ptr);
-                        break;
-                    default:
-                        throw new Exception($"Bls12381 operation fault, type:format, error:type mismatch");
-                }
+                Marshal.FreeHGlobal(ptr);
+                //ptr = IntPtr.Zero;
             }
             catch (Exception)
             {
diff --git a/src/Neo.Cryptography.BLS12_381/Interop.cs b/src/Neo.Cryptography.BLS12_381/Interop.cs
index 873d057..264bfc6 100644
--- a/src/Neo.Cryptography.BLS12_381/Interop.cs
+++ b/src/Neo.Cryptography.BLS12_381/Interop.cs
@@ -32,15 +32,6 @@ internal static class Interop
         [DllImport("Neo_Cryptography_BLS12_381_Native", CallingConvention = CallingConvention.Cdecl)]
         public static extern IntPtr g2_neg(IntPtr g2);
 
-        [DllImport("Neo_Cryptography_BLS12_381_Native", CallingConvention = CallingConvention.Cdecl)]
-        public static extern void gt_dispose(IntPtr rawPtr);
-
-        [DllImport("Neo_Cryptography_BLS12_381_Native", CallingConvention = CallingConvention.Cdecl)]
-        public static extern void g1_dispose(IntPtr rawPtr);
-
-        [DllImport("Neo_Cryptography_BLS12_381_Native", CallingConvention = CallingConvention.Cdecl)]
-        public static extern void g2_dispose(IntPtr rawPtr);
-
         [DllImport("Neo_Cryptography_BLS12_381_Native", CallingConvention = CallingConvention.Cdecl)]
         public static extern IntPtr g1_g2_pairing(IntPtr g1, IntPtr g2);