diff --git a/utils/rand_code.go b/utils/rand_code.go
new file mode 100644
index 0000000..4ca7184
--- /dev/null
+++ b/utils/rand_code.go
@@ -0,0 +1,23 @@
+package utils
+
+import (
+	"crypto/md5"
+	"fmt"
+	"math/rand"
+	"time"
+)
+
+const charset = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+
+func GenerateInviteCode(userID uint) string {
+	rand.Seed(time.Now().UnixNano())
+	// 拼接用户ID和随机数
+	data := fmt.Sprintf("%d%d", userID, rand.Intn(1000000))
+	hash := md5.Sum([]byte(data))
+	code := ""
+	for i := 0; i < 6; i++ {
+		// 取哈希的前6位，每位映射到字符集
+		code += string(charset[int(hash[i])%len(charset)])
+	}
+	return code
+}