diff --git a/frame/dvm/src/mock.rs b/frame/dvm/src/mock.rs
index ce9c1aabac..ba5ffb6b48 100644
--- a/frame/dvm/src/mock.rs
+++ b/frame/dvm/src/mock.rs
@@ -22,17 +22,20 @@ use crate::{
 	*,
 };
 use codec::{Decode, Encode};
-use darwinia_evm::{AddressMapping, EnsureAddressTruncated, FeeCalculator, IssuingHandler};
+use darwinia_evm::{AddressMapping, EnsureAddressTruncated, FeeCalculator};
+use dp_evm::Precompile;
 use ethereum::{TransactionAction, TransactionSignature};
-use frame_support::{traits::GenesisBuild, ConsensusEngineId, PalletId};
+use evm::{Context, ExitError, ExitSucceed};
+use frame_support::{traits::GenesisBuild, ConsensusEngineId};
 use frame_system::mocking::*;
 use rlp::*;
 use sp_core::{H160, H256, U256};
 use sp_runtime::{
 	testing::Header,
 	traits::{BlakeTwo256, IdentityLookup},
-	AccountId32, DispatchResult, Perbill, RuntimeDebug,
+	AccountId32, Perbill, RuntimeDebug,
 };
+use sp_std::{marker::PhantomData, vec::Vec};
 
 darwinia_support::impl_test_account_data! {}
 
@@ -136,7 +139,6 @@ impl FindAuthor<H160> for EthereumFindAuthor {
 frame_support::parameter_types! {
 	pub const TransactionByteFee: u64 = 1;
 	pub const ChainId: u64 = 42;
-	pub const EVMPalletId: PalletId = PalletId(*b"py/evmpa");
 	pub const BlockGasLimit: U256 = U256::MAX;
 }
 
@@ -150,6 +152,17 @@ impl AddressMapping<AccountId32> for HashedAddressMapping {
 	}
 }
 
+pub struct RingBack<T>(PhantomData<T>);
+impl<T: darwinia_evm::Config> Precompile for RingBack<T> {
+	fn execute(
+		input: &[u8],
+		target_gas: Option<u64>,
+		context: &Context,
+	) -> core::result::Result<(ExitSucceed, Vec<u8>, u64), ExitError> {
+		darwinia_evm_precompile_transfer::ring::RingBack::<T>::transfer(&input, target_gas, context)
+	}
+}
+
 impl darwinia_evm::Config for Test {
 	type FeeCalculator = FixedGasPrice;
 	type GasWeightMapping = ();
@@ -163,7 +176,7 @@ impl darwinia_evm::Config for Test {
 		darwinia_evm_precompile_simple::Sha256,
 		darwinia_evm_precompile_simple::Ripemd160,
 		darwinia_evm_precompile_simple::Identity,
-		darwinia_evm_precompile_withdraw::WithDraw<Self>,
+		RingBack<Test>,
 	);
 	type ChainId = ChainId;
 	type BlockGasLimit = BlockGasLimit;
@@ -173,7 +186,7 @@ impl darwinia_evm::Config for Test {
 	type IssuingHandler = ();
 }
 
-impl Config for Test {
+impl dvm_ethereum::Config for Test {
 	type Event = ();
 	type FindAuthor = EthereumFindAuthor;
 	type StateRoot = IntermediateStateRoot;
diff --git a/frame/evm/precompile/contracts/transfer/src/lib.rs b/frame/evm/precompile/contracts/transfer/src/lib.rs
index 27f385b58d..b21a02b3de 100644
--- a/frame/evm/precompile/contracts/transfer/src/lib.rs
+++ b/frame/evm/precompile/contracts/transfer/src/lib.rs
@@ -18,8 +18,8 @@
 
 #![cfg_attr(not(feature = "std"), no_std)]
 
-mod kton;
-mod ring;
+pub mod kton;
+pub mod ring;
 pub mod util;
 
 // --- substrate ---
@@ -37,7 +37,6 @@ pub type AccountId<T> = <T as frame_system::Config>::AccountId;
 /// Transfer Precompile Contract, used to support the exchange of KTON and RING tranfer.
 ///
 /// The contract address: 0000000000000000000000000000000000000015
-#[derive(PartialEq, Eq, Debug)]
 pub enum Transfer<T> {
 	/// Transfer RING bach from dvm to darwinia
 	RingBack,
diff --git a/frame/evm/precompile/contracts/transfer/src/ring.rs b/frame/evm/precompile/contracts/transfer/src/ring.rs
index 4e7fff2ac8..a755872004 100644
--- a/frame/evm/precompile/contracts/transfer/src/ring.rs
+++ b/frame/evm/precompile/contracts/transfer/src/ring.rs
@@ -21,7 +21,7 @@ impl<T: Config> RingBack<T> {
 	/// 2. transfer from the contract address to withdrawal address
 	///
 	/// Input data: 32-bit substrate withdrawal public key
-	pub(crate) fn transfer(
+	pub fn transfer(
 		input: &[u8],
 		_: Option<u64>,
 		context: &Context,