diff --git a/contracts/tomo.go b/contracts/utils.go
similarity index 54%
rename from contracts/tomo.go
rename to contracts/utils.go
index 7e1007e79b..e40e1da0be 100644
--- a/contracts/tomo.go
+++ b/contracts/utils.go
@@ -2,10 +2,14 @@ package contracts
 
 import (
 	"github.com/ethereum/go-ethereum/accounts"
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/contracts/blocksigner/contract"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/ethclient"
 	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/node"
 	"github.com/ethereum/go-ethereum/params"
 	"math/big"
 )
@@ -14,6 +18,18 @@ const (
 	HexSignMethod = "2fb1b25f"
 )
 
+// Get ethClient over IPC of current node.
+func GetEthClient(ctx *node.ServiceContext) (*ethclient.Client, error) {
+	conf := ctx.GetConfig()
+	client, err := ethclient.Dial(conf.IPCEndpoint())
+	if err != nil {
+		log.Error("Fail to connect RPC", "error", err)
+		return nil, err
+	}
+
+	return client, nil
+}
+
 // Send tx sign for block number to smart contract blockSigner.
 func CreateTransactionSign(chainConfig *params.ChainConfig, pool *core.TxPool, manager *accounts.Manager, block *types.Block) {
 	// Find active account.
@@ -41,3 +57,22 @@ func CreateTransactionSign(chainConfig *params.ChainConfig, pool *core.TxPool, m
 	// Add tx signed to local tx pool.
 	pool.AddLocal(txSigned)
 }
+
+// Get signers signed for blockNumber from blockSigner contract.
+func GetSignersFromContract(ctx *node.ServiceContext, blockNumber uint64) ([]common.Address, error) {
+	client, err := GetEthClient(ctx)
+	if err != nil {
+		log.Error("Fail to connect IPC from blockSigner", "error", err)
+		return nil, err
+	}
+	addr := common.HexToAddress(common.BlockSigners)
+	blockSigner, err := contract.NewBlockSigner(addr, client)
+	if err != nil {
+		log.Error("Fail get block signers", "error", err)
+		return nil, err
+	}
+	opts := new(bind.CallOpts)
+	addrs, err := blockSigner.GetSigners(opts, new(big.Int).SetUint64(blockNumber))
+
+	return addrs, nil
+}
diff --git a/eth/backend.go b/eth/backend.go
index b497cd560c..70732aeb3a 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -27,13 +27,12 @@ import (
 
 	"encoding/json"
 	"github.com/ethereum/go-ethereum/accounts"
-	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/consensus"
 	"github.com/ethereum/go-ethereum/consensus/clique"
 	"github.com/ethereum/go-ethereum/consensus/ethash"
-	"github.com/ethereum/go-ethereum/contracts/blocksigner/contract"
+	"github.com/ethereum/go-ethereum/contracts"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/bloombits"
 	"github.com/ethereum/go-ethereum/core/state"
@@ -42,7 +41,6 @@ import (
 	"github.com/ethereum/go-ethereum/eth/downloader"
 	"github.com/ethereum/go-ethereum/eth/filters"
 	"github.com/ethereum/go-ethereum/eth/gasprice"
-	"github.com/ethereum/go-ethereum/ethclient"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/internal/ethapi"
@@ -199,21 +197,6 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 
 			number := header.Number.Uint64()
 			rCheckpoint := chain.Config().Clique.RewardCheckpoint
-
-			// Call to smart contract signer.
-			config := ctx.GetConfig()
-			client, err := ethclient.Dial(config.IPCEndpoint())
-			if err != nil {
-				log.Error("Fail to connect RPC", "error", err)
-				return err
-			}
-			addr := common.HexToAddress(common.BlockSigners)
-			blockSigner, err := contract.NewBlockSigner(addr, client)
-			if err != nil {
-				log.Error("Fail get block signer", "error", err)
-				return err
-			}
-			opts := new(bind.CallOpts)
 			prevCheckpoint := number - rCheckpoint
 
 			if number > 0 && prevCheckpoint > 0 {
@@ -225,9 +208,9 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 
 				for i := startBlockNumber; i <= endBlockNumber; i++ {
 					// Get signers in blockSigner smartcontract.
-					addrs, err := blockSigner.GetSigners(opts, new(big.Int).SetUint64(i))
+					addrs, err := contracts.GetSignersFromContract(ctx, i)
 					if err != nil {
-						log.Error("Fail to get signers from smartcontract.", "error", err)
+						log.Error("Fail to get signers from smartcontract.", "error", err, "blockNumber", i)
 						return err
 					}
 					// Filter duplicate address.