diff --git a/contracts/utils.go b/contracts/utils.go
index 609991cf6d..e98714c6e9 100644
--- a/contracts/utils.go
+++ b/contracts/utils.go
@@ -8,9 +8,7 @@ import (
 	"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"
 )
@@ -24,18 +22,6 @@ type rewardLog struct {
 	Reward *big.Int `json:"reward"`
 }
 
-// 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) error {
 	if chainConfig.Clique != nil {
diff --git a/eth/backend.go b/eth/backend.go
index fc5f5134f6..b78dc2d78a 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -40,6 +40,7 @@ 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"
@@ -93,7 +94,9 @@ type Ethereum struct {
 	networkId     uint64
 	netRPCService *ethapi.PublicNetAPI
 
-	lock sync.RWMutex // Protects the variadic fields (e.g. gas price and etherbase)
+	lock        sync.RWMutex // Protects the variadic fields (e.g. gas price and etherbase)
+	IPCEndpoint string
+	Client      *ethclient.Client // Global ipc client instance.
 }
 
 func (s *Ethereum) AddLesServer(ls LesServer) {
@@ -183,6 +186,9 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 	if eth.chainConfig.Clique != nil {
 		c := eth.engine.(*clique.Clique)
 
+		// Set global ipc endpoint.
+		eth.IPCEndpoint = ctx.GetConfig().IPCEndpoint()
+
 		// Inject hook for send tx sign to smartcontract after insert block into chain.
 		importedHook := func(block *types.Block) {
 			snap, err := c.GetSnapshot(eth.blockchain, block.Header())
@@ -201,15 +207,17 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 
 		// Hook reward for clique validator.
 		c.HookReward = func(chain consensus.ChainReader, state *state.StateDB, header *types.Header) error {
+			client, err := eth.GetClient()
+			if err != nil {
+				log.Error("Fail to connect IPC client for blockSigner", "error", err)
+
+				return err
+			}
+
 			number := header.Number.Uint64()
 			rCheckpoint := chain.Config().Clique.RewardCheckpoint
 			if number > 0 && number-rCheckpoint > 0 {
 				// Get signers in blockSigner smartcontract.
-				client, err := contracts.GetEthClient(ctx)
-				if err != nil {
-					log.Error("Fail to connect IPC from blockSigner", "error", err)
-					return err
-				}
 				addr := common.HexToAddress(common.BlockSigners)
 				chainReward := new(big.Int).SetUint64(chain.Config().Clique.Reward * params.Ether)
 				totalSigner := new(uint64)
@@ -506,4 +514,19 @@ func (s *Ethereum) Stop() error {
 	close(s.shutdownChan)
 
 	return nil
+}
+
+// Get current IPC Client.
+func (s *Ethereum) GetClient() (*ethclient.Client, error) {
+	if s.Client == nil {
+		// Inject ipc client global instance.
+		client, err := ethclient.Dial(s.IPCEndpoint)
+		if err != nil {
+			log.Error("Fail to connect RPC", "error", err)
+			return nil, err
+		}
+		s.Client = client
+	}
+
+	return s.Client, nil
 }
\ No newline at end of file