diff --git a/sidepanel/sidepanel.js b/sidepanel/sidepanel.js
index 11a5c16..fd4bfab 100644
--- a/sidepanel/sidepanel.js
+++ b/sidepanel/sidepanel.js
@@ -255,6 +255,7 @@ const DEFAULT_CPA_CALLBACK_MODE = 'step8';
 const MAIL_2925_MODE_PROVIDE = 'provide';
 const MAIL_2925_MODE_RECEIVE = 'receive';
 const DEFAULT_MAIL_2925_MODE = MAIL_2925_MODE_PROVIDE;
+const NEW_USER_GUIDE_PROMPT_DISMISSED_STORAGE_KEY = 'multipage-new-user-guide-prompt-dismissed';
 const AUTO_SKIP_FAILURES_PROMPT_DISMISSED_STORAGE_KEY = 'multipage-auto-skip-failures-prompt-dismissed';
 const AUTO_RUN_FALLBACK_RISK_PROMPT_DISMISSED_STORAGE_KEY = 'multipage-auto-run-fallback-risk-prompt-dismissed';
 const CONTRIBUTION_CONTENT_PROMPT_DISMISSED_VERSION_STORAGE_KEY = 'multipage-contribution-content-prompt-dismissed-version';
@@ -876,6 +877,59 @@ function setPromptDismissed(storageKey, dismissed) {
   }
 }
 
+function isNewUserGuidePromptDismissed() {
+  return isPromptDismissed(NEW_USER_GUIDE_PROMPT_DISMISSED_STORAGE_KEY);
+}
+
+function setNewUserGuidePromptDismissed(dismissed) {
+  setPromptDismissed(NEW_USER_GUIDE_PROMPT_DISMISSED_STORAGE_KEY, dismissed);
+}
+
+function shouldPromptNewUserGuide() {
+  if (isNewUserGuidePromptDismissed()) {
+    return false;
+  }
+  if (!btnContributionMode || btnContributionMode.disabled) {
+    return false;
+  }
+  if (latestState?.contributionMode) {
+    return false;
+  }
+  return true;
+}
+
+function getContributionPortalUrl() {
+  return String(contributionContentService?.portalUrl || 'https://apikey.qzz.io').trim();
+}
+
+function openNewUserGuidePrompt() {
+  return openActionModal({
+    title: '新手引导',
+    message: '如果你是第一次使用，可以先查看贡献页里的公告和使用教程。点击“查看引导”会自动打开贡献页面。',
+    alert: {
+      text: '本提示仅出现一次。',
+    },
+    actions: [
+      { id: null, label: '取消', variant: 'btn-ghost' },
+      { id: 'confirm', label: '查看引导', variant: 'btn-primary' },
+    ],
+  });
+}
+
+async function maybeShowNewUserGuidePrompt() {
+  if (!shouldPromptNewUserGuide()) {
+    return false;
+  }
+
+  setNewUserGuidePromptDismissed(true);
+  const choice = await openNewUserGuidePrompt();
+  if (choice === 'confirm') {
+    openExternalUrl(getContributionPortalUrl());
+    return true;
+  }
+  return false;
+}
+
 function getDismissedContributionContentPromptVersion() {
   return String(localStorage.getItem(CONTRIBUTION_CONTENT_PROMPT_DISMISSED_VERSION_STORAGE_KEY) || '').trim();
 }
@@ -4948,7 +5002,12 @@ restoreState().then(() => {
   updatePanelModeUI();
   updateButtonStates();
   updateStatusDisplay(latestState);
-  return refreshContributionContentHint();
+  return refreshContributionContentHint()
+    .catch((error) => {
+      console.warn('Failed to refresh contribution content hint during initialization:', error);
+      return null;
+    })
+    .then(() => maybeShowNewUserGuidePrompt());
 }).catch((err) => {
   console.error('Failed to initialize sidepanel state:', err);
 });
diff --git a/tests/sidepanel-new-user-guide.test.js b/tests/sidepanel-new-user-guide.test.js
new file mode 100644
index 0000000..0c64a53
--- /dev/null
+++ b/tests/sidepanel-new-user-guide.test.js
@@ -0,0 +1,182 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+
+const source = fs.readFileSync('sidepanel/sidepanel.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 ${name}`);
+  }
+
+  let parenDepth = 0;
+  let signatureEnded = false;
+  let braceStart = -1;
+  for (let i = start; i < source.length; i += 1) {
+    const ch = source[i];
+    if (ch === '(') {
+      parenDepth += 1;
+    } else if (ch === ')') {
+      parenDepth -= 1;
+      if (parenDepth === 0) {
+        signatureEnded = true;
+      }
+    } else if (ch === '{' && signatureEnded) {
+      braceStart = i;
+      break;
+    }
+  }
+
+  let depth = 0;
+  let end = braceStart;
+  for (; end < source.length; end += 1) {
+    const ch = source[end];
+    if (ch === '{') depth += 1;
+    if (ch === '}') {
+      depth -= 1;
+      if (depth === 0) {
+        end += 1;
+        break;
+      }
+    }
+  }
+
+  return source.slice(start, end);
+}
+
+test('new user guide prompt is only eligible before the one-time dismissal is set', () => {
+  const bundle = [
+    extractFunction('isPromptDismissed'),
+    extractFunction('setPromptDismissed'),
+    extractFunction('isNewUserGuidePromptDismissed'),
+    extractFunction('setNewUserGuidePromptDismissed'),
+    extractFunction('shouldPromptNewUserGuide'),
+  ].join('\n');
+
+  const api = new Function(`
+const NEW_USER_GUIDE_PROMPT_DISMISSED_STORAGE_KEY = 'multipage-new-user-guide-prompt-dismissed';
+const storage = new Map();
+const localStorage = {
+  getItem(key) {
+    return storage.has(key) ? storage.get(key) : null;
+  },
+  setItem(key, value) {
+    storage.set(key, String(value));
+  },
+  removeItem(key) {
+    storage.delete(key);
+  },
+};
+const btnContributionMode = { disabled: false };
+let latestState = { contributionMode: false };
+${bundle}
+return {
+  shouldPromptNewUserGuide,
+  setDismissed(value) {
+    setNewUserGuidePromptDismissed(value);
+  },
+  setButtonDisabled(value) {
+    btnContributionMode.disabled = Boolean(value);
+  },
+  setContributionMode(value) {
+    latestState = { contributionMode: Boolean(value) };
+  },
+};
+`)();
+
+  assert.equal(api.shouldPromptNewUserGuide(), true);
+
+  api.setDismissed(true);
+  assert.equal(api.shouldPromptNewUserGuide(), false);
+
+  api.setDismissed(false);
+  api.setButtonDisabled(true);
+  assert.equal(api.shouldPromptNewUserGuide(), false);
+
+  api.setButtonDisabled(false);
+  api.setContributionMode(true);
+  assert.equal(api.shouldPromptNewUserGuide(), false);
+});
+
+test('new user guide prompt persists dismissal before awaiting the user choice and opens the contribution page on confirm', async () => {
+  const bundle = [
+    extractFunction('isPromptDismissed'),
+    extractFunction('setPromptDismissed'),
+    extractFunction('isNewUserGuidePromptDismissed'),
+    extractFunction('setNewUserGuidePromptDismissed'),
+    extractFunction('shouldPromptNewUserGuide'),
+    extractFunction('getContributionPortalUrl'),
+    extractFunction('openNewUserGuidePrompt'),
+    extractFunction('maybeShowNewUserGuidePrompt'),
+  ].join('\n');
+
+  const api = new Function(`
+const NEW_USER_GUIDE_PROMPT_DISMISSED_STORAGE_KEY = 'multipage-new-user-guide-prompt-dismissed';
+const storage = new Map();
+const localStorage = {
+  getItem(key) {
+    return storage.has(key) ? storage.get(key) : null;
+  },
+  setItem(key, value) {
+    storage.set(key, String(value));
+  },
+  removeItem(key) {
+    storage.delete(key);
+  },
+};
+const btnContributionMode = { disabled: false };
+const latestState = { contributionMode: false };
+const contributionContentService = { portalUrl: 'https://apikey.qzz.io' };
+const openedUrls = [];
+let modalOptions = null;
+let nextChoice = 'confirm';
+function openExternalUrl(url) {
+  openedUrls.push(url);
+}
+function openActionModal(options) {
+  modalOptions = options;
+  return Promise.resolve(nextChoice);
+}
+${bundle}
+return {
+  maybeShowNewUserGuidePrompt,
+  getDismissed() {
+    return localStorage.getItem(NEW_USER_GUIDE_PROMPT_DISMISSED_STORAGE_KEY);
+  },
+  getOpenedUrls() {
+    return openedUrls.slice();
+  },
+  getModalOptions() {
+    return modalOptions;
+  },
+  setNextChoice(choice) {
+    nextChoice = choice;
+  },
+};
+`)();
+
+  const confirmed = await api.maybeShowNewUserGuidePrompt();
+  const modalOptions = api.getModalOptions();
+
+  assert.equal(confirmed, true);
+  assert.equal(api.getDismissed(), '1');
+  assert.deepStrictEqual(api.getOpenedUrls(), ['https://apikey.qzz.io']);
+  assert.equal(modalOptions.title, '新手引导');
+  assert.equal(modalOptions.alert.text, '本提示仅出现一次。');
+  assert.deepStrictEqual(
+    modalOptions.actions.map((item) => ({ id: item.id, label: item.label })),
+    [
+      { id: null, label: '取消' },
+      { id: 'confirm', label: '查看引导' },
+    ]
+  );
+
+  api.setNextChoice(null);
+  const skipped = await api.maybeShowNewUserGuidePrompt();
+  assert.equal(skipped, false);
+  assert.deepStrictEqual(api.getOpenedUrls(), ['https://apikey.qzz.io']);
+});