diff --git a/internal/sms/mock.go b/internal/sms/mock.go
new file mode 100644
index 0000000..8f0bfa0
--- /dev/null
+++ b/internal/sms/mock.go
@@ -0,0 +1,13 @@
+package sms
+
+import "log"
+
+// MockSender 模拟短信发送器，用于开发模式
+// 不真实发送短信，仅通过日志打印验证码，便于本地调试
+type MockSender struct{}
+
+// Send 模拟发送验证码，打印到日志并返回 nil
+func (m *MockSender) Send(phone string, code string) error {
+	log.Printf("[MockSMS] 手机号: %s, 验证码: %s", phone, code)
+	return nil
+}