diff --git a/alipay/client.go b/alipay/client.go
index 399fb444..17d0d8da 100644
--- a/alipay/client.go
+++ b/alipay/client.go
@@ -1,10 +1,10 @@
 package alipay
 
 import (
-	"context"
 	"crypto/rsa"
 	"crypto/sha1"
 	"crypto/sha256"
+	"encoding/base64"
 	"encoding/json"
 	"fmt"
 	"hash"
@@ -12,6 +12,7 @@ import (
 	"time"
 
 	"github.com/go-pay/gopay"
+	"github.com/go-pay/gopay/pkg/aes"
 	"github.com/go-pay/gopay/pkg/util"
 	"github.com/go-pay/gopay/pkg/xhttp"
 	"github.com/go-pay/gopay/pkg/xlog"
@@ -30,7 +31,8 @@ type Client struct {
 	SignType           string
 	AppAuthToken       string
 	IsProd             bool
-	bodySize           int // http response body size(MB), default is 10MB
+	aesKey             string // biz_content 加密的 AES KEY
+	ivKey              []byte
 	privateKey         *rsa.PrivateKey
 	aliPayPublicKey    *rsa.PublicKey // 支付宝证书公钥内容 alipayPublicCert.crt
 	autoSign           bool
@@ -91,18 +93,10 @@ func (a *Client) SetBodySize(sizeMB int) {
 	}
 }
 
-// Deprecated
-// 推荐使用 PostAliPayAPISelfV2()
-// 示例：请参考 client_test.go 的 TestClient_PostAliPayAPISelf() 方法
-func (a *Client) PostAliPayAPISelf(ctx context.Context, bm gopay.BodyMap, method string, aliRsp any) (err error) {
-	var bs []byte
-	if bs, err = a.doAliPay(ctx, bm, method); err != nil {
-		return err
-	}
-	if err = json.Unmarshal(bs, aliRsp); err != nil {
-		return err
-	}
-	return nil
+// SetAESKey 设置 biz_content 的AES加密key，设置此参数默认开启 biz_content 参数加密
+func (a *Client) SetAESKey(aesKey string) {
+	a.aesKey = aesKey
+	a.ivKey = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
 }
 
 // Deprecated
@@ -197,7 +191,20 @@ func (a *Client) pubParamsHandle(bm gopay.BodyMap, method, bizContent string, au
 		pubBody.Set("auth_token", authToken[0])
 	}
 	if bizContent != util.NULL {
-		pubBody.Set("biz_content", bizContent)
+		if a.aesKey == util.NULL {
+			pubBody.Set("biz_content", bizContent)
+		} else {
+			// AES Encrypt biz_content
+			encryptBizContent, err := a.encryptBizContent(bizContent)
+			if err != nil {
+				return "", fmt.Errorf("EncryptBizContent Error: %w", err)
+			}
+			if a.DebugSwitch == gopay.DebugOn {
+				xlog.Debugf("Alipay_Origin_BizContent: %s", bizContent)
+				xlog.Debugf("Alipay_Encrypt_BizContent: %s", encryptBizContent)
+			}
+			pubBody.Set("biz_content", encryptBizContent)
+		}
 	}
 	// sign
 	sign, err := a.getRsaSign(pubBody, pubBody.GetString("sign_type"))
@@ -242,3 +249,11 @@ func (a *Client) checkPublicParam(bm gopay.BodyMap) {
 		bm.Set("app_auth_token", a.AppAuthToken)
 	}
 }
+
+func (a *Client) encryptBizContent(originData string) (string, error) {
+	encryptData, err := aes.CBCEncrypt([]byte(originData), []byte(a.aesKey), a.ivKey)
+	if err != nil {
+		return "", err
+	}
+	return base64.StdEncoding.EncodeToString(encryptData), nil
+}
diff --git a/alipay/client_test.go b/alipay/client_test.go
index 887db588..a6885a4f 100644
--- a/alipay/client_test.go
+++ b/alipay/client_test.go
@@ -42,6 +42,9 @@ func TestMain(m *testing.M) {
 		SetReturnUrl("https://www.fmm.ink").
 		SetNotifyUrl("https://www.fmm.ink")
 
+	// 设置biz_content加密KEY，设置此参数默认开启加密（目前未测试成功）
+	//client.SetAESKey("KvKUTqSVZX2fUgmxnFyMaQ==")
+
 	// 自动同步验签（只支持证书模式）
 	// 传入 支付宝公钥证书 alipayPublicCert.crt 内容
 	client.AutoVerifySign(cert.AlipayPublicContentRSA2)
diff --git a/alipay/common_api.go b/alipay/common_api.go
index d435f302..2dc3cd99 100644
--- a/alipay/common_api.go
+++ b/alipay/common_api.go
@@ -34,8 +34,7 @@ func FormatURLParam(body gopay.BodyMap) (urlParam string) {
 // encryptedData:包括敏感数据在内的完整用户信息的加密数据
 // secretKey:AES密钥，支付宝管理平台配置
 // beanPtr:需要解析到的结构体指针
-// 文档：https://opendocs.alipay.com/mini/introduce/aes
-// 文档：https://opendocs.alipay.com/open/common/104567
+// 文档：https://opendocs.alipay.com/common/02mse3
 func DecryptOpenDataToStruct(encryptedData, secretKey string, beanPtr any) (err error) {
 	if encryptedData == util.NULL || secretKey == util.NULL {
 		return errors.New("encryptedData or secretKey is null")
@@ -76,8 +75,7 @@ func DecryptOpenDataToStruct(encryptedData, secretKey string, beanPtr any) (err
 // DecryptOpenDataToBodyMap 解密支付宝开放数据到 BodyMap
 // encryptedData:包括敏感数据在内的完整用户信息的加密数据
 // secretKey:AES密钥，支付宝管理平台配置
-// 文档：https://opendocs.alipay.com/mini/introduce/aes
-// 文档：https://opendocs.alipay.com/open/common/104567
+// 文档：https://opendocs.alipay.com/common/02mse3
 func DecryptOpenDataToBodyMap(encryptedData, secretKey string) (bm gopay.BodyMap, err error) {
 	if encryptedData == util.NULL || secretKey == util.NULL {
 		return nil, errors.New("encryptedData or secretKey is null")
diff --git a/doc/alipay.md b/doc/alipay.md
index 3aa85e8c..88aae8fd 100644
--- a/doc/alipay.md
+++ b/doc/alipay.md
@@ -49,6 +49,9 @@ SetReturnUrl("https://www.fmm.ink").            // 设置返回URL
     SetNotifyUrl("https://www.fmm.ink").        // 设置异步通知URL
     SetAppAuthToken()                           // 设置第三方应用授权
 
+// 设置biz_content加密KEY，设置此参数默认开启加密
+client.SetAESKey("1234567890123456")
+
 // 自动同步验签（只支持证书模式）
 // 传入 alipayPublicCert.crt 内容
 client.AutoVerifySign([]byte("alipayPublicCert.crt bytes"))