diff --git a/api/grpc/account.go b/api/grpc/account.go
index fd1b3bf..aea0043 100644
--- a/api/grpc/account.go
+++ b/api/grpc/account.go
@@ -3,6 +3,7 @@ package grpc
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 
 	"github.com/meshplus/bitxhub-kit/types"
 	"github.com/meshplus/bitxhub-model/pb"
@@ -16,6 +17,10 @@ type Account struct {
 }
 
 func (cbs *ChainBrokerService) GetAccountBalance(ctx context.Context, req *pb.Address) (*pb.Response, error) {
+	if !types.IsValidAddressByte([]byte(req.Address)) {
+		return nil, fmt.Errorf("invalid account address: %v", req.Address)
+	}
+
 	addr := types.String2Address(req.Address)
 
 	account := cbs.api.Account().GetAccount(addr)
diff --git a/go.mod b/go.mod
index a4b6804..458439c 100644
--- a/go.mod
+++ b/go.mod
@@ -22,7 +22,7 @@ require (
 	github.com/libp2p/go-libp2p-core v0.3.0
 	github.com/magiconair/properties v1.8.1
 	github.com/meshplus/bitxhub-core v0.1.0-rc1.0.20200728032028-8dba332fa0ed
-	github.com/meshplus/bitxhub-kit v1.0.1-0.20200728033443-0aaa0b3cf4c2
+	github.com/meshplus/bitxhub-kit v1.0.1-0.20200729105047-4407a5e4e168
 	github.com/meshplus/bitxhub-model v1.0.0-rc4.0.20200724062514-baa44473e4d8
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/multiformats/go-multiaddr v0.2.0
diff --git a/go.sum b/go.sum
index 060f0ef..41be344 100644
--- a/go.sum
+++ b/go.sum
@@ -507,8 +507,8 @@ github.com/meshplus/bitxhub-kit v1.0.0-rc1 h1:gNi8IFU5CMHT3KE2I4ACj5alMW9h/4cV8x
 github.com/meshplus/bitxhub-kit v1.0.0-rc1/go.mod h1:ra/AhOkPvpElI+wXrB9G6DjdcrdxFU3vMwA5MYKr9D0=
 github.com/meshplus/bitxhub-kit v1.0.1-0.20200727075316-ea098a3c3411 h1:iA/VUBsZqsk2ZB9KrJRLl8X0tPUQqle2c7HRCHLFmDE=
 github.com/meshplus/bitxhub-kit v1.0.1-0.20200727075316-ea098a3c3411/go.mod h1:8Pprmnq+2fFi5kJP0qcbwPl/fe22nro0OamjtwD0LJM=
-github.com/meshplus/bitxhub-kit v1.0.1-0.20200728033443-0aaa0b3cf4c2 h1:bkArMGFQdZW3WO2A3Fx+J6vdV/ISXFBCJP3RTXwgJzk=
-github.com/meshplus/bitxhub-kit v1.0.1-0.20200728033443-0aaa0b3cf4c2/go.mod h1:8Pprmnq+2fFi5kJP0qcbwPl/fe22nro0OamjtwD0LJM=
+github.com/meshplus/bitxhub-kit v1.0.1-0.20200729105047-4407a5e4e168 h1:OUZuHqVUNMPMkpSc9cxAkUlsRDTb25l8NtOsps3sF74=
+github.com/meshplus/bitxhub-kit v1.0.1-0.20200729105047-4407a5e4e168/go.mod h1:8Pprmnq+2fFi5kJP0qcbwPl/fe22nro0OamjtwD0LJM=
 github.com/meshplus/bitxhub-model v1.0.0-rc4.0.20200514093243-7e8ae60d1c19 h1:D0n0/NqaueI6r+/cJIjYzWwjZ9j/5l36r/c8MYqTdXg=
 github.com/meshplus/bitxhub-model v1.0.0-rc4.0.20200514093243-7e8ae60d1c19/go.mod h1:QK8aACbxtZEA3Hk1BOCirW0uxMWLsMrLDpWz9FweIKM=
 github.com/meshplus/bitxhub-model v1.0.0-rc4.0.20200724062514-baa44473e4d8 h1:FlD+ETNIVTJ3gyceEdqqo6wvBkrYiTfLB6XM0tGH1Yw=