diff --git a/alipay/client.go b/alipay/client.go
index 17d0d8da..15847812 100644
--- a/alipay/client.go
+++ b/alipay/client.go
@@ -2,13 +2,9 @@ package alipay
 
 import (
 	"crypto/rsa"
-	"crypto/sha1"
-	"crypto/sha256"
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
-	"hash"
-	"sync"
 	"time"
 
 	"github.com/go-pay/gopay"
@@ -39,9 +35,6 @@ type Client struct {
 	DebugSwitch        gopay.DebugSwitch
 	location           *time.Location
 	hc                 *xhttp.Client
-	sha1Hash           hash.Hash
-	sha256Hash         hash.Hash
-	mu                 sync.Mutex
 }
 
 // 初始化支付宝客户端
@@ -66,8 +59,6 @@ func NewClient(appid, privateKey string, isProd bool) (client *Client, err error
 		privateKey:  priKey,
 		DebugSwitch: gopay.DebugOff,
 		hc:          xhttp.NewClient(),
-		sha1Hash:    sha1.New(),
-		sha256Hash:  sha256.New(),
 	}
 	return client, nil
 }
diff --git a/alipay/sign.go b/alipay/sign.go
index dba8d1b2..a8dd3905 100644
--- a/alipay/sign.go
+++ b/alipay/sign.go
@@ -182,25 +182,22 @@ func (a *Client) getRsaSign(bm gopay.BodyMap, signType string) (sign string, err
 
 	switch signType {
 	case RSA:
-		h = a.sha1Hash
+		h = sha1.New()
 		hashs = crypto.SHA1
 	case RSA2:
-		h = a.sha256Hash
+		h = sha256.New()
 		hashs = crypto.SHA256
 	default:
-		h = a.sha256Hash
+		h = sha256.New()
 		hashs = crypto.SHA256
 	}
 	signParams := bm.EncodeAliPaySignParams()
 	if a.DebugSwitch == gopay.DebugOn {
 		xlog.Debugf("Alipay_Request_SignStr: %s", signParams)
 	}
-	a.mu.Lock()
-	defer func() {
-		h.Reset()
-		a.mu.Unlock()
-	}()
-	h.Write([]byte(signParams))
+	if _, err = h.Write([]byte(signParams)); err != nil {
+		return
+	}
 	if encryptedBytes, err = rsa.SignPKCS1v15(rand.Reader, a.privateKey, hashs, h.Sum(nil)); err != nil {
 		return util.NULL, fmt.Errorf("[%w]: %+v", gopay.SignatureErr, err)
 	}
diff --git a/wechat/v3/client.go b/wechat/v3/client.go
index f795d473..2242f96b 100644
--- a/wechat/v3/client.go
+++ b/wechat/v3/client.go
@@ -3,8 +3,6 @@ package wechat
 import (
 	"context"
 	"crypto/rsa"
-	"crypto/sha256"
-	"hash"
 	"sync"
 
 	"github.com/go-pay/gopay"
@@ -21,7 +19,6 @@ type ClientV3 struct {
 	WxSerialNo  string
 	autoSign    bool
 	rwMu        sync.RWMutex
-	sha256Hash  hash.Hash
 	hc          *xhttp.Client
 	privateKey  *rsa.PrivateKey
 	wxPublicKey *rsa.PublicKey
@@ -48,7 +45,6 @@ func NewClientV3(mchid, serialNo, apiV3Key, privateKey string) (client *ClientV3
 		SerialNo:    serialNo,
 		ApiV3Key:    []byte(apiV3Key),
 		privateKey:  priKey,
-		sha256Hash:  sha256.New(),
 		ctx:         context.Background(),
 		DebugSwitch: gopay.DebugOff,
 		hc:          xhttp.NewClient(),
diff --git a/wechat/v3/sign.go b/wechat/v3/sign.go
index e04ff063..eeccd1ce 100644
--- a/wechat/v3/sign.go
+++ b/wechat/v3/sign.go
@@ -254,13 +254,9 @@ func (c *ClientV3) rsaSign(str string) (string, error) {
 	if c.privateKey == nil {
 		return "", errors.New("privateKey can't be nil")
 	}
-	c.rwMu.Lock()
-	defer func() {
-		c.sha256Hash.Reset()
-		c.rwMu.Unlock()
-	}()
-	c.sha256Hash.Write([]byte(str))
-	result, err := rsa.SignPKCS1v15(rand.Reader, c.privateKey, crypto.SHA256, c.sha256Hash.Sum(nil))
+	h := sha256.New()
+	h.Write([]byte(str))
+	result, err := rsa.SignPKCS1v15(rand.Reader, c.privateKey, crypto.SHA256, h.Sum(nil))
 	if err != nil {
 		return util.NULL, fmt.Errorf("[%w]: %+v", gopay.SignatureErr, err)
 	}
@@ -292,13 +288,9 @@ func (c *ClientV3) verifySyncSign(si *SignInfo) (err error) {
 	}
 	str := si.HeaderTimestamp + "\n" + si.HeaderNonce + "\n" + si.SignBody + "\n"
 	signBytes, _ := base64.StdEncoding.DecodeString(si.HeaderSignature)
-	c.rwMu.Lock()
-	defer func() {
-		c.sha256Hash.Reset()
-		c.rwMu.Unlock()
-	}()
-	c.sha256Hash.Write([]byte(str))
-	if err = rsa.VerifyPKCS1v15(wxPublicKey, crypto.SHA256, c.sha256Hash.Sum(nil), signBytes); err != nil {
+	h := sha256.New()
+	h.Write([]byte(str))
+	if err = rsa.VerifyPKCS1v15(wxPublicKey, crypto.SHA256, h.Sum(nil), signBytes); err != nil {
 		return fmt.Errorf("[%w]: %v", gopay.VerifySignatureErr, err)
 	}
 	return nil