diff --git a/src/frontend/src/components/EdictBoard.tsx b/src/frontend/src/components/EdictBoard.tsx
index a731af2..efe3a2f 100644
--- a/src/frontend/src/components/EdictBoard.tsx
+++ b/src/frontend/src/components/EdictBoard.tsx
@@ -478,17 +478,27 @@ export default function EdictBoard() {
             <option key={pid} value={pid}>📁 {info.name || pid}</option>
           ))}
         </select>
-        {selectedProjectId && !selectedProjectId.startsWith('_') && selectedProjectId !== '__general__' && (
-          <button
-            onClick={() => setShowProjectAction(!showProjectAction)}
-            title="项目操作"
-            style={{
+        {selectedProjectId && !selectedProjectId.startsWith('_') && selectedProjectId !== '__general__' && (() => {
+          const pInfo = projects[selectedProjectId] as any;
+          const isLocked = pInfo?.source === 'sanguo_projects_scan' || selectedProjectId === '_general';
+          return isLocked ? (
+            <button disabled title="自动发现的项目不可删除" style={{
               padding: '2px 6px', borderRadius: 4, fontSize: 11,
               border: '1px solid var(--line)', background: 'var(--panel)',
-              color: 'var(--fg)', cursor: 'pointer',
-            }}
-          >⋯</button>
-        )}
+              color: '#555', cursor: 'not-allowed', opacity: 0.4,
+            }}>🔒</button>
+          ) : (
+            <button
+              onClick={() => setShowProjectAction(!showProjectAction)}
+              title="项目操作"
+              style={{
+                padding: '2px 6px', borderRadius: 4, fontSize: 11,
+                border: '1px solid var(--line)', background: 'var(--panel)',
+                color: 'var(--fg)', cursor: 'pointer',
+              }}
+            >⋯</button>
+          );
+        })()}
         {showProjectAction && selectedProjectId && !selectedProjectId.startsWith('_') && (
           <ProjectActionPopup
             projectId={selectedProjectId}