diff --git a/background/message-router.js b/background/message-router.js
index c293b16..27b212a 100644
--- a/background/message-router.js
+++ b/background/message-router.js
@@ -151,6 +151,18 @@
           if (payload.email) {
             await setEmailState(payload.email);
           }
+          if (payload.skipRegistrationFlow) {
+            const latestState = await getState();
+            for (const skipStep of [3, 4, 5]) {
+              const status = latestState.stepStatuses?.[skipStep];
+              if (status === 'running' || status === 'completed' || status === 'manual_completed') {
+                continue;
+              }
+              await setStepStatus(skipStep, 'skipped');
+            }
+            await addLog('步骤 2：检测到当前已登录会话，已自动跳过步骤 3/4/5，流程将直接进入步骤 6。', 'warn');
+            break;
+          }
           if (payload.skippedPasswordStep) {
             const latestState = await getState();
             const step3Status = latestState.stepStatuses?.[3];
diff --git a/tests/background-message-router-step2-skip.test.js b/tests/background-message-router-step2-skip.test.js
index e4d27eb..7cc8794 100644
--- a/tests/background-message-router-step2-skip.test.js
+++ b/tests/background-message-router-step2-skip.test.js
@@ -151,6 +151,25 @@ test('message router does not overwrite a completed step 3 when step 2 is replay
   assert.deepStrictEqual(events.stepStatuses, []);
 });
 
+test('message router skips steps 3/4/5 when step 2 detects already logged-in session', async () => {
+  const { router, events } = createRouter({
+    state: { stepStatuses: { 3: 'pending', 4: 'completed', 5: 'pending' } },
+  });
+
+  await router.handleStepData(2, {
+    email: 'user@example.com',
+    skipRegistrationFlow: true,
+    skippedPasswordStep: true,
+  });
+
+  assert.deepStrictEqual(events.emailStates, ['user@example.com']);
+  assert.deepStrictEqual(events.stepStatuses, [
+    { step: 3, status: 'skipped' },
+    { step: 5, status: 'skipped' },
+  ]);
+  assert.equal(events.logs[0]?.message, '步骤 2：检测到当前已登录会话，已自动跳过步骤 3/4/5，流程将直接进入步骤 6。');
+});
+
 test('message router finalizes step 3 before marking it completed', async () => {
   const { router, events } = createRouter();