diff --git a/xy_sh/internal/biz/biz.go b/xy_sh/internal/biz/biz.go
new file mode 100644
index 0000000..0039bba
--- /dev/null
+++ b/xy_sh/internal/biz/biz.go
@@ -0,0 +1,67 @@
+package biz
+
+import (
+	"encoding/json"
+	"xy_sh/internal/config"
+	"xy_sh/internal/entities"
+	"xy_sh/pkg/crypto"
+)
+
+// Biz 业务逻辑层
+type Biz struct {
+	cfg *config.Config
+}
+
+// NewBiz 创建业务逻辑实例
+func NewBiz(cfg *config.Config) *Biz {
+	return &Biz{cfg: cfg}
+}
+
+// EncryptResponse 加密响应数据
+func (b *Biz) EncryptResponse(data interface{}) (string, error) {
+	jsonBytes, err := json.Marshal(data)
+	if err != nil {
+		return "", err
+	}
+	return crypto.SM4ECBEncrypt(jsonBytes, b.cfg.SM4Key)
+}
+
+// DecryptRequest 解密请求数据
+func (b *Biz) DecryptRequest(encryptedData string) ([]byte, error) {
+	return crypto.SM4ECBDecrypt(encryptedData, b.cfg.SM4Key)
+}
+
+// ProcessOrder 处理下单请求
+func (b *Biz) ProcessOrder(req *entities.OrderRequest) (*entities.OrderResponse, error) {
+	return &entities.OrderResponse{
+		OrderNo:    "HM" + generateOrderNo(),
+		Status:     0,
+		ExpireTime: "2025-12-31 23:59:59",
+	}, nil
+}
+
+// ProcessQuery 处理订单查询请求
+func (b *Biz) ProcessQuery(req *entities.QueryRequest) (*entities.QueryResponse, error) {
+	return &entities.QueryResponse{
+		OrderNo: req.OrderNo,
+		Status:  0,
+	}, nil
+}
+
+// ProcessWechatRecharge 处理微信立减金充值请求
+func (b *Biz) ProcessWechatRecharge(req *entities.WechatRechargeRequest) (*entities.WechatRechargeResponse, error) {
+	return &entities.WechatRechargeResponse{
+		OrderNo: req.OrderNo,
+		Status:  0,
+	}, nil
+}
+
+// ProcessCallback 处理回调通知
+func (b *Biz) ProcessCallback(req *entities.CallbackRequest) error {
+	return nil
+}
+
+// generateOrderNo 生成订单号（示例）
+func generateOrderNo() string {
+	return "0000000000000000"
+}
\ No newline at end of file