diff --git a/src/handlers/payment.rs b/src/handlers/payment.rs
index d142ced..a21dd0d 100644
--- a/src/handlers/payment.rs
+++ b/src/handlers/payment.rs
@@ -170,18 +170,17 @@ fn build_alipay_form_html(
 
     let sign = rsa2_sign(&sign_source, &config.private_key)?;
 
-    // 生成自动提交的表单 HTML
+    // 生成自动提交的表单 HTML（使用原始值，浏览器会自动 URL 编码）
     let mut form_fields = String::new();
     for (k, v) in &params {
         form_fields.push_str(&format!(
             r#"<input type="hidden" name="{}" value="{}" />"#,
-            urlencoding(k),
-            urlencoding(v)
+            k, v
         ));
     }
     form_fields.push_str(&format!(
         r#"<input type="hidden" name="sign" value="{}" />"#,
-        urlencoding(&sign)
+        &sign
     ));
 
     let html = format!(