diff --git a/package-lock.json b/package-lock.json
index d980ead..dc5e2c8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "peoplelib",
-  "version": "2.1.3",
+  "version": "2.1.4",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "peoplelib",
-      "version": "2.1.3",
+      "version": "2.1.4",
       "license": "MIT",
       "dependencies": {
         "foliate-js": "1.0.1",
diff --git a/package.json b/package.json
index a488a5d..3397a38 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "peoplelib",
-  "version": "2.1.3",
+  "version": "2.1.4",
   "description": "多源开放文献、电子书与本地书库客户端",
   "main": "main.js",
   "author": "peoplelib",
diff --git a/src/_test/sources.test.js b/src/_test/sources.test.js
index 08733a8..e8905b3 100644
--- a/src/_test/sources.test.js
+++ b/src/_test/sources.test.js
@@ -16,6 +16,11 @@ test('注册表：每个源都实现完整接口', () => {
     }
     assert.ok(s.name, `${s.id} 缺 name`);
   }
+  assert.strictEqual(list.find((source) => source.id === 'zlib').downloadOnDemand, true);
+  assert.ok(
+    list.filter((source) => source.id !== 'zlib').every((source) => source.downloadOnDemand === false),
+    '只有会消耗下载额度的 Z-Library 应按点击解析'
+  );
 });
 
 test('注册表：开放教材与中英文维基文库已启用', () => {
@@ -527,7 +532,9 @@ test('zlib: postId 缺 hash 时详情仍可用', async () => {
     });
     const d = await zlib.detail('123/');
     assert.strictEqual(d.title, 'B');
+    assert.strictEqual(urls.length, 1, '打开详情不应顺带请求下载接口');
     assert.ok(urls[0].includes('/eapi/book/123'), urls[0]);
+    assert.ok(!urls[0].includes('/file'), '打开详情消耗了下载额度: ' + urls[0]);
     assert.ok(!urls[0].includes('/eapi/book/123/?'), '缺 hash 时不该留下尾斜杠: ' + urls[0]);
   } finally {
     auth.getSession = origSession;
diff --git a/src/_test/ui.test.js b/src/_test/ui.test.js
index f2f4a54..5c4ddf5 100644
--- a/src/_test/ui.test.js
+++ b/src/_test/ui.test.js
@@ -218,6 +218,28 @@ test('下载区接入全局任务中心且完成按钮使用高对比绿色底
   assert.match(rule[1], /color:\s*#07130b/);
 });
 
+test('Z-Library 进入详情不消耗下载额度，点击下载后才解析并开始任务', () => {
+  const browse = fs.readFileSync(path.join(__dirname, '..', 'ui', 'views', 'browse.js'), 'utf8');
+  const openDetail = browse.slice(
+    browse.indexOf('async function openDetail'),
+    browse.indexOf('function sourceNameOf')
+  );
+  assert.match(openDetail, /if \(sourceDownloadsOnDemand\(activeSourceId\)\)/);
+  assert.match(openDetail, /renderOnDemandDownload\(postId, activeSourceId, token\)/);
+  assert.match(openDetail, /else\s*\{\s*loadDownload\(postId, activeSourceId, token\)/);
+
+  const onDemand = browse.slice(
+    browse.indexOf('function renderOnDemandDownload'),
+    browse.indexOf('// 当前条目的元数据')
+  );
+  const clickAt = onDemand.indexOf('btn.onclick = async');
+  const resolveAt = onDemand.indexOf('window.api.sources.download', clickAt);
+  const startAt = onDemand.indexOf('download.click()', resolveAt);
+  assert.ok(clickAt >= 0 && resolveAt > clickAt, '下载地址在用户点击前被获取');
+  assert.ok(startAt > resolveAt, '解析下载地址后没有立即开始真实下载');
+  assert.match(onDemand, /每日免费下载额度有限，仅在点击后获取下载地址/);
+});
+
 test('主窗口在设置旁提供持久化明暗主题切换', () => {
   const html = fs.readFileSync(path.join(__dirname, '..', 'ui', 'index.html'), 'utf8');
   const app = fs.readFileSync(path.join(__dirname, '..', 'ui', 'app.js'), 'utf8');
diff --git a/src/sources/index.js b/src/sources/index.js
index e1aa8b0..12f19a7 100644
--- a/src/sources/index.js
+++ b/src/sources/index.js
@@ -36,7 +36,12 @@ const sources = [
 const byId = new Map(sources.map((s) => [s.id, s]));
 
 function listSources() {
-  return sources.map((s) => ({ id: s.id, name: s.name, supportsSearch: s.supportsSearch !== false }));
+  return sources.map((s) => ({
+    id: s.id,
+    name: s.name,
+    supportsSearch: s.supportsSearch !== false,
+    downloadOnDemand: s.downloadOnDemand === true
+  }));
 }
 
 function getSource(id) {
diff --git a/src/sources/zlib.js b/src/sources/zlib.js
index a508c2a..8c6e60f 100644
--- a/src/sources/zlib.js
+++ b/src/sources/zlib.js
@@ -270,6 +270,7 @@ module.exports = {
   id: 'zlib',
   name: 'Z-Library',
   supportsSearch: true,
+  downloadOnDemand: true,
 
   // 无关键词时展示热门书目
   async list(page) {
diff --git a/src/ui/views/browse.js b/src/ui/views/browse.js
index bb57871..cba19ae 100644
--- a/src/ui/views/browse.js
+++ b/src/ui/views/browse.js
@@ -314,7 +314,11 @@ const Browse = (() => {
     }
     state.currentDetail = res.data;
     renderDetail(res.data);
-    loadDownload(postId, activeSourceId, token);
+    if (sourceDownloadsOnDemand(activeSourceId)) {
+      renderOnDemandDownload(postId, activeSourceId, token);
+    } else {
+      loadDownload(postId, activeSourceId, token);
+    }
     refreshAddButton();
   }
 
@@ -323,6 +327,11 @@ const Browse = (() => {
     return s ? s.name : id;
   }
 
+  function sourceDownloadsOnDemand(id) {
+    const source = state.sourceList.find((item) => item.id === id);
+    return !!(source && source.downloadOnDemand);
+  }
+
   function renderDetail(d) {
     const tagsHtml = (d.tags || []).map((t) => {
       const idx = t.indexOf('：');
@@ -391,7 +400,10 @@ const Browse = (() => {
       $('dlRetry').onclick = () => loadDownload(postId, sourceId, token);
       return;
     }
-    const d = res.data;
+    renderDownloadResult(box, res.data);
+  }
+
+  function renderDownloadResult(box, d) {
     let html = '';
     const files = d.files || [];
     if (files.length) {
@@ -412,6 +424,34 @@ const Browse = (() => {
     box.querySelectorAll('[data-open]').forEach((a) => { a.onclick = (e) => { e.preventDefault(); window.api.openExternal(a.dataset.open); }; });
   }
 
+  function renderOnDemandDownload(postId, sourceId, token) {
+    const box = $('downloadBox');
+    if (!box) return;
+    box.innerHTML = `<div class="dl-files"><div class="dl-file-row">
+      <span class="dl-file-name">每日免费下载额度有限，仅在点击后获取下载地址</span>
+      <button class="dl-btn" id="onDemandDownloadBtn">下载</button>
+    </div></div>`;
+    const btn = $('onDemandDownloadBtn');
+    btn.onclick = async () => {
+      const oldError = box.querySelector('.dl-error');
+      if (oldError) oldError.remove();
+      btn.disabled = true;
+      btn.textContent = '获取中...';
+      const res = await window.api.sources.download(sourceId, postId);
+      if (!box.isConnected || token !== state.detailToken) return;
+      if (!res.ok) {
+        btn.disabled = false;
+        btn.textContent = '重试';
+        btn.title = res.error || '获取下载地址失败';
+        box.insertAdjacentHTML('beforeend', `<div class="dl-error">获取失败：${escapeHtml(res.error)}</div>`);
+        return;
+      }
+      renderDownloadResult(box, res.data);
+      const download = box.querySelector('.dl-btn[data-file]');
+      if (download) download.click();
+    };
+  }
+
   // 当前条目的元数据，供下载时自动建库用
   function entryMeta() {
     const d = state.currentDetail || {};