diff --git a/background.js b/background.js
index fdcd07d..e234edf 100644
--- a/background.js
+++ b/background.js
@@ -1712,23 +1712,27 @@ async function reuseOrCreateTab(source, url, options = {}) {
 // ============================================================
 
 async function sendToContentScript(source, message, options = {}) {
+  throwIfStopped();
   const { responseTimeoutMs = getContentScriptResponseTimeoutMs(message) } = options;
   const registry = await getTabRegistry();
   const entry = registry[source];
 
   if (!entry || !entry.ready) {
+    throwIfStopped();
     console.log(LOG_PREFIX, `${source} not ready, queuing command`);
     return queueCommand(source, message);
   }
 
   // Verify tab is still alive
   const alive = await isTabAlive(source);
+  throwIfStopped();
   if (!alive) {
     // Tab was closed — queue the command, it will be sent when tab is reopened
     console.log(LOG_PREFIX, `${source} tab was closed, queuing command`);
     return queueCommand(source, message);
   }
 
+  throwIfStopped();
   console.log(LOG_PREFIX, `Sending to ${source} (tab ${entry.tabId}):`, message.type);
   return sendTabMessageWithTimeout(entry.tabId, source, message, responseTimeoutMs);
 }
@@ -3810,13 +3814,17 @@ function getVerificationPollPayload(step, state, overrides = {}) {
 }
 
 async function requestVerificationCodeResend(step) {
+  throwIfStopped();
   const signupTabId = await getTabId('signup-page');
   if (!signupTabId) {
     throw new Error('认证页面标签页已关闭，无法重新请求验证码。');
   }
 
+  throwIfStopped();
   await chrome.tabs.update(signupTabId, { active: true });
+  throwIfStopped();
   await addLog(`步骤 ${step}：正在请求新的${getVerificationCodeLabel(step)}验证码...`, 'warn');
+  throwIfStopped();
 
   const result = await sendToContentScript('signup-page', {
     type: 'RESEND_VERIFICATION_CODE',
@@ -3863,6 +3871,7 @@ async function pollFreshVerificationCode(step, state, mail, pollOverrides = {})
   const maxRounds = pollOverrides.maxRounds || VERIFICATION_POLL_MAX_ROUNDS;
 
   for (let round = 1; round <= maxRounds; round++) {
+    throwIfStopped();
     if (round > 1) {
       await requestVerificationCodeResend(step);
     }
@@ -3902,6 +3911,9 @@ async function pollFreshVerificationCode(step, state, mail, pollOverrides = {})
 
       return result;
     } catch (err) {
+      if (isStopError(err)) {
+        throw err;
+      }
       lastError = err;
       await addLog(`步骤 ${step}：${err.message}`, 'warn');
       if (round < maxRounds) {
@@ -3963,7 +3975,7 @@ async function resolveVerificationStep(step, state, mail, options = {}) {
       await requestVerificationCodeResend(step);
       await addLog(`步骤 ${step}：已先请求一封新的${getVerificationCodeLabel(step)}验证码，再开始轮询邮箱。`, 'warn');
     } catch (err) {
-      if (step === 7 && isStep7RestartFromStep6Error(err)) {
+      if (isStopError(err) || (step === 7 && isStep7RestartFromStep6Error(err))) {
         throw err;
       }
       await addLog(`步骤 ${step}：首次重新获取验证码失败：${err.message}，将继续使用当前时间窗口轮询。`, 'warn');
@@ -3984,7 +3996,9 @@ async function resolveVerificationStep(step, state, mail, options = {}) {
       filterAfterTimestamp: nextFilterAfterTimestamp ?? undefined,
     });
 
+    throwIfStopped();
     await addLog(`步骤 ${step}：已获取${getVerificationCodeLabel(step)}验证码：${result.code}`);
+    throwIfStopped();
     const submitResult = await submitVerificationCode(step, result.code);
 
     if (submitResult.invalidCode) {
@@ -4023,6 +4037,7 @@ async function executeStep4(state) {
   }
 
   await chrome.tabs.update(signupTabId, { active: true });
+  throwIfStopped();
   await addLog('步骤 4：正在确认注册验证码页面是否就绪，必要时自动恢复密码页超时报错...');
   const prepareResult = await sendToContentScriptResilient(
     'signup-page',
@@ -4050,6 +4065,7 @@ async function executeStep4(state) {
     return;
   }
 
+  throwIfStopped();
   if (mail.provider === HOTMAIL_PROVIDER) {
     await addLog(`步骤 4：正在通过 ${mail.label} 轮询验证码...`);
   } else {
@@ -4161,6 +4177,7 @@ async function runStep7Attempt(state) {
     await reuseOrCreateTab('signup-page', state.oauthUrl);
   }
 
+  throwIfStopped();
   await addLog('步骤 7：正在准备认证页，必要时切换到一次性验证码登录...');
   const prepareResult = await sendToContentScript('signup-page', {
     type: 'PREPARE_LOGIN_CODE',
@@ -4178,6 +4195,7 @@ async function runStep7Attempt(state) {
     throw new Error(prepareResult.error);
   }
 
+  throwIfStopped();
   if (mail.provider === HOTMAIL_PROVIDER) {
     await addLog(`步骤 7：正在通过 ${mail.label} 轮询验证码...`);
   } else {
diff --git a/tests/verification-stop-propagation.test.js b/tests/verification-stop-propagation.test.js
new file mode 100644
index 0000000..1ecbea1
--- /dev/null
+++ b/tests/verification-stop-propagation.test.js
@@ -0,0 +1,186 @@
+const assert = require('assert');
+const fs = require('fs');
+
+const source = fs.readFileSync('background.js', 'utf8');
+
+function extractFunction(name) {
+  const markers = [`async function ${name}(`, `function ${name}(`];
+  const start = markers
+    .map(marker => source.indexOf(marker))
+    .find(index => index >= 0);
+  if (start < 0) {
+    throw new Error(`missing function ${name}`);
+  }
+
+  let parenDepth = 0;
+  let signatureEnded = false;
+  let braceStart = -1;
+  for (let i = start; i < source.length; i += 1) {
+    const ch = source[i];
+    if (ch === '(') {
+      parenDepth += 1;
+    } else if (ch === ')') {
+      parenDepth -= 1;
+      if (parenDepth === 0) {
+        signatureEnded = true;
+      }
+    } else if (ch === '{' && signatureEnded) {
+      braceStart = i;
+      break;
+    }
+  }
+  if (braceStart < 0) {
+    throw new Error(`missing body for function ${name}`);
+  }
+
+  let depth = 0;
+  let end = braceStart;
+  for (; end < source.length; end += 1) {
+    const ch = source[end];
+    if (ch === '{') depth += 1;
+    if (ch === '}') {
+      depth -= 1;
+      if (depth === 0) {
+        end += 1;
+        break;
+      }
+    }
+  }
+
+  return source.slice(start, end);
+}
+
+async function testPollFreshVerificationCodeRethrowsStop() {
+  const bundle = [
+    extractFunction('isStopError'),
+    extractFunction('throwIfStopped'),
+    extractFunction('pollFreshVerificationCode'),
+  ].join('\n');
+
+  const api = new Function(`
+let stopRequested = false;
+const STOP_ERROR_MESSAGE = '流程已被用户停止。';
+const HOTMAIL_PROVIDER = 'hotmail-api';
+const VERIFICATION_POLL_MAX_ROUNDS = 5;
+const logs = [];
+let resendCalls = 0;
+
+function getHotmailVerificationPollConfig() {
+  return {};
+}
+async function pollHotmailVerificationCode() {
+  throw new Error('hotmail path should not run in this test');
+}
+function getVerificationCodeStateKey(step) {
+  return step === 4 ? 'lastSignupCode' : 'lastLoginCode';
+}
+function getVerificationPollPayload(step, state, overrides = {}) {
+  return {
+    filterAfterTimestamp: 123,
+    ...overrides,
+  };
+}
+async function sendToMailContentScriptResilient() {
+  throw new Error(STOP_ERROR_MESSAGE);
+}
+async function requestVerificationCodeResend() {
+  resendCalls += 1;
+}
+async function addLog(message, level) {
+  logs.push({ message, level });
+}
+
+${bundle}
+
+return {
+  pollFreshVerificationCode,
+  snapshot() {
+    return { logs, resendCalls };
+  },
+};
+`)();
+
+  let error = null;
+  try {
+    await api.pollFreshVerificationCode(7, {}, { provider: 'qq' }, {});
+  } catch (err) {
+    error = err;
+  }
+
+  const state = api.snapshot();
+  assert.strictEqual(error?.message, '流程已被用户停止。', 'Stop 错误应原样向上抛出');
+  assert.strictEqual(state.resendCalls, 0, 'Stop 后不应继续请求新的验证码');
+  assert.deepStrictEqual(state.logs, [], 'Stop 后不应再记录普通失败或重试日志');
+}
+
+async function testResolveVerificationStepRethrowsStopFromFreshRequest() {
+  const bundle = [
+    extractFunction('isStopError'),
+    extractFunction('resolveVerificationStep'),
+  ].join('\n');
+
+  const api = new Function(`
+const STOP_ERROR_MESSAGE = '流程已被用户停止。';
+const HOTMAIL_PROVIDER = 'hotmail-api';
+const logs = [];
+let pollCalls = 0;
+
+function getVerificationCodeStateKey(step) {
+  return step === 4 ? 'lastSignupCode' : 'lastLoginCode';
+}
+function getHotmailVerificationPollConfig() {
+  return {};
+}
+function getVerificationCodeLabel(step) {
+  return step === 4 ? '注册' : '登录';
+}
+function isStep7RestartFromStep6Error() {
+  return false;
+}
+async function requestVerificationCodeResend() {
+  throw new Error(STOP_ERROR_MESSAGE);
+}
+async function addLog(message, level) {
+  logs.push({ message, level });
+}
+async function pollFreshVerificationCode() {
+  pollCalls += 1;
+  return { code: '123456', emailTimestamp: Date.now() };
+}
+async function submitVerificationCode() {
+  throw new Error('submit should not run in this test');
+}
+async function setState() {}
+async function completeStepFromBackground() {}
+
+${bundle}
+
+return {
+  resolveVerificationStep,
+  snapshot() {
+    return { logs, pollCalls };
+  },
+};
+`)();
+
+  let error = null;
+  try {
+    await api.resolveVerificationStep(7, {}, { provider: 'qq' }, { requestFreshCodeFirst: true });
+  } catch (err) {
+    error = err;
+  }
+
+  const state = api.snapshot();
+  assert.strictEqual(error?.message, '流程已被用户停止。', '首次请求新验证码收到 Stop 后应立即终止');
+  assert.strictEqual(state.pollCalls, 0, 'Stop 后不应继续进入邮箱轮询');
+  assert.deepStrictEqual(state.logs, [], 'Stop 后不应追加降级日志');
+}
+
+(async () => {
+  await testPollFreshVerificationCodeRethrowsStop();
+  await testResolveVerificationStepRethrowsStopFromFreshRequest();
+  console.log('verification stop propagation tests passed');
+})().catch((error) => {
+  console.error(error);
+  process.exit(1);
+});