diff --git a/App.jsx b/App.jsx
index 979d477..6fb823c 100644
--- a/App.jsx
+++ b/App.jsx
@@ -4279,7 +4279,7 @@ async function jmsResolveIp(domain) {
   return answer ? answer.data : null;
 }
 
-function JmsLineCard({ line, ip, onRefreshIp, onCheck, onCopy, onQr, onEdit, onDelete }) {
+function JmsLineCard({ line, ip, onRefreshIp, onCheck, onCopy, onQr, onDuplicate, onEdit, onDelete }) {
   const meta = JMS_PROTO_META[line.protocol];
   const status = line.monitorStatus || 'normal';
   const dotClass = status === 'abnormal' ? 'jms-dot-abnormal' : status === 'checking' ? 'jms-dot-checking' : 'jms-dot-normal';
@@ -4320,8 +4320,9 @@ function JmsLineCard({ line, ip, onRefreshIp, onCheck, onCopy, onQr, onEdit, onD
       <div className="jms-card-actions">
         <button className="btn btn-sm" onClick={() => onCopy(line)}><Copy size={13} />复制链接</button>
         <button className="btn btn-sm" onClick={() => onQr(line)}><QrCode size={13} />二维码</button>
-        <button className="btn btn-sm btn-ghost" onClick={() => onEdit(line)}><Edit2 size={13} /></button>
-        <button className="btn btn-sm btn-ghost btn-danger" onClick={() => onDelete(line.id)}><Trash2 size={13} /></button>
+        <button className="btn btn-sm btn-ghost" onClick={() => onDuplicate(line)} title="复制为新线路"><Layers size={13} /></button>
+        <button className="btn btn-sm btn-ghost" onClick={() => onEdit(line)} title="编辑"><Edit2 size={13} /></button>
+        <button className="btn btn-sm btn-ghost btn-danger" onClick={() => onDelete(line.id)} title="删除"><Trash2 size={13} /></button>
       </div>
     </div>
   );
@@ -4434,6 +4435,15 @@ function JmsPage({ lines, onSave, onDelete, onCheck, onNotify }) {
     setDraft({ ...line });
     setModalOpen(true);
   }
+  function duplicateLine(line) {
+    setEditingId(null); // 不带id，保存时会当成全新的一条线路，不会覆盖原线路
+    setGroup(line.group);
+    setProtocol(line.protocol);
+    const { id, monitorStatus, lastChecked, ...rest } = line;
+    setDraft({ ...rest, name: line.name ? `${line.name} 副本` : '' });
+    setModalOpen(true);
+    onNotify('已复制配置，改一下地址/端口/名称就能存成新线路');
+  }
   function closeModal() { setModalOpen(false); }
 
   function handleGroupChange(g) {
@@ -4481,6 +4491,7 @@ function JmsPage({ lines, onSave, onDelete, onCheck, onNotify }) {
             onCheck={onCheck}
             onCopy={copyLink}
             onQr={openQr}
+            onDuplicate={duplicateLine}
             onEdit={openEditModal}
             onDelete={onDelete}
           />