diff --git a/CHANGELOG.md b/CHANGELOG.md
index 26591baa..3941408b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@
 
 ## [Unreleased]
 
+### Changed
+
+- 配置面板改为左右分区布局：左侧分区导航（常规 / 连接 / AI / 关于）、右侧按分区归类展示配置项，替代此前单列平铺；分区结构为后续扩展（主题、编辑器风格、上下文窗口等）预留。
+
 ## [0.6.0] - 2026-06-23
 
 > 首个 0.6 正式版。本版重点：
diff --git a/apps/desktop/src/renderer/src/components/common/Modal.tsx b/apps/desktop/src/renderer/src/components/common/Modal.tsx
index b2d7a56f..a09ce85d 100644
--- a/apps/desktop/src/renderer/src/components/common/Modal.tsx
+++ b/apps/desktop/src/renderer/src/components/common/Modal.tsx
@@ -3,9 +3,10 @@ import { useTranslation } from 'react-i18next';
 import type { CSSProperties, ReactNode } from 'react';
 import { CloseIcon } from './icons';
 
-type ModalSize = 'md' | 'sm' | 'confirm';
+type ModalSize = 'lg' | 'md' | 'sm' | 'confirm';
 
 const SIZE_CLASS: Record<ModalSize, string> = {
+  lg: 'modal modal-lg',
   md: 'modal',
   sm: 'modal modal-sm',
   confirm: 'modal modal-confirm',
diff --git a/apps/desktop/src/renderer/src/components/features/settings/SettingsModal.tsx b/apps/desktop/src/renderer/src/components/features/settings/SettingsModal.tsx
index b0cc2d43..27db360a 100644
--- a/apps/desktop/src/renderer/src/components/features/settings/SettingsModal.tsx
+++ b/apps/desktop/src/renderer/src/components/features/settings/SettingsModal.tsx
@@ -1,6 +1,14 @@
+import { useState } from 'react';
 import { useTranslation } from 'react-i18next';
 import type { AppInfo, AppPaths, Config, SupportedLanguage } from '@meebox/shared';
-import { ConfirmModal, Modal } from '../../common';
+import {
+  ConfirmModal,
+  GlobeIcon,
+  Modal,
+  QuestionIcon,
+  RobotIcon,
+  SettingsIcon,
+} from '../../common';
 import { useSettingsDraft } from './hooks/useSettingsDraft';
 import { ConnectionEditorModal } from './editors/ConnectionEditorModal';
 import { LlmEditorModal } from './editors/LlmEditorModal';
@@ -15,6 +23,23 @@ import { WorkDirSection } from './sections/WorkDirSection';
 import { CacheDirSection } from './sections/CacheDirSection';
 import { RuntimeSection } from './sections/RuntimeSection';
 
+type SettingsCategory = 'general' | 'connection' | 'ai' | 'about';
+
+/**
+ * 配置分区导航元数据（左侧栏）。新增配置分区在此登记一项，并在右侧面板的 switch
+ * 中渲染对应 section —— 分区结构为后续扩展（主题 / 编辑器 / 上下文窗口等）预留。
+ */
+const SETTINGS_CATEGORIES: ReadonlyArray<{
+  id: SettingsCategory;
+  labelKey: string;
+  Icon: typeof SettingsIcon;
+}> = [
+  { id: 'general', labelKey: 'settings.catGeneral', Icon: SettingsIcon },
+  { id: 'connection', labelKey: 'settings.catConnection', Icon: GlobeIcon },
+  { id: 'ai', labelKey: 'settings.catAi', Icon: RobotIcon },
+  { id: 'about', labelKey: 'settings.catAbout', Icon: QuestionIcon },
+];
+
 interface SettingsModalProps {
   info: AppInfo;
   paths: AppPaths;
@@ -48,6 +73,7 @@ export function SettingsModal({
   onClose,
 }: SettingsModalProps) {
   const { t } = useTranslation();
+  const [category, setCategory] = useState<SettingsCategory>('general');
   const s = useSettingsDraft({
     config,
     paths,
@@ -61,10 +87,11 @@ export function SettingsModal({
   return (
     <>
       <Modal
-        size="md"
+        size="lg"
         onClose={onClose}
         title={t('settings.title')}
         headerClose="icon"
+        bodyClassName="settings-modal-body"
         footer={
           <>
             <div className="modal-footer-left">
@@ -94,38 +121,70 @@ export function SettingsModal({
           </>
         }
       >
-        <LanguageSection language={s.language} onChange={s.handleLanguageChange} />
-        <ConnectionsSection
-          connections={s.connections}
-          activeConnId={s.activeConnId}
-          onAdd={s.openAddConn}
-          onEdit={s.openEditConn}
-          onSetActive={s.setActiveConn}
-          onRequestDelete={s.setConnDeleteId}
-        />
-        <PollerSection value={s.pollerInput} onChange={s.setPoller} />
-        <LlmSection
-          llm={s.llm}
-          onAdd={s.openAddProfile}
-          onEdit={s.openEditProfile}
-          onSetActive={s.setActiveLlm}
-          onDelete={s.deleteProfile}
-        />
-        <ProxySection proxy={s.proxy} onConfigure={() => s.setProxyEditor(s.proxy)} />
-        <AgentDirSection
-          value={s.agentDirInput}
-          onChange={s.setAgentDir}
-          onPick={() => void s.pickAgentDir()}
-        />
-        <WorkDirSection paths={paths} />
-        <CacheDirSection
-          paths={paths}
-          value={s.reposDirInput}
-          onChange={s.setReposDir}
-          onPick={() => void s.pickReposDir()}
-          totalBytes={s.totalBytes}
-        />
-        <RuntimeSection info={info} updateEnabled={config.update.check_enabled} />
+        <div className="settings-layout">
+          <nav className="settings-nav" aria-label={t('settings.title')}>
+            {SETTINGS_CATEGORIES.map(({ id, labelKey, Icon }) => (
+              <button
+                key={id}
+                type="button"
+                className={`settings-nav-item${category === id ? ' active' : ''}`}
+                aria-current={category === id ? 'page' : undefined}
+                onClick={() => setCategory(id)}
+              >
+                <Icon size={16} />
+                <span>{t(labelKey)}</span>
+              </button>
+            ))}
+          </nav>
+          <div className="settings-panel">
+            {category === 'general' && (
+              <LanguageSection language={s.language} onChange={s.handleLanguageChange} />
+            )}
+            {category === 'connection' && (
+              <>
+                <ConnectionsSection
+                  connections={s.connections}
+                  activeConnId={s.activeConnId}
+                  onAdd={s.openAddConn}
+                  onEdit={s.openEditConn}
+                  onSetActive={s.setActiveConn}
+                  onRequestDelete={s.setConnDeleteId}
+                />
+                <PollerSection value={s.pollerInput} onChange={s.setPoller} />
+                <ProxySection proxy={s.proxy} onConfigure={() => s.setProxyEditor(s.proxy)} />
+                <CacheDirSection
+                  paths={paths}
+                  value={s.reposDirInput}
+                  onChange={s.setReposDir}
+                  onPick={() => void s.pickReposDir()}
+                  totalBytes={s.totalBytes}
+                />
+              </>
+            )}
+            {category === 'ai' && (
+              <>
+                <LlmSection
+                  llm={s.llm}
+                  onAdd={s.openAddProfile}
+                  onEdit={s.openEditProfile}
+                  onSetActive={s.setActiveLlm}
+                  onDelete={s.deleteProfile}
+                />
+                <AgentDirSection
+                  value={s.agentDirInput}
+                  onChange={s.setAgentDir}
+                  onPick={() => void s.pickAgentDir()}
+                />
+              </>
+            )}
+            {category === 'about' && (
+              <>
+                <WorkDirSection paths={paths} />
+                <RuntimeSection info={info} updateEnabled={config.update.check_enabled} />
+              </>
+            )}
+          </div>
+        </div>
       </Modal>
 
       {s.llmEditor && (
diff --git a/apps/desktop/src/renderer/src/i18n/locales/de-DE.json b/apps/desktop/src/renderer/src/i18n/locales/de-DE.json
index f04dd454..0cdab16a 100644
--- a/apps/desktop/src/renderer/src/i18n/locales/de-DE.json
+++ b/apps/desktop/src/renderer/src/i18n/locales/de-DE.json
@@ -636,6 +636,10 @@
     "cacheDirTitle": "Cache-Verzeichnis",
     "cacheUsage": "Cache-Nutzung",
     "calculating": "Berechne…",
+    "catAbout": "Info",
+    "catAi": "KI",
+    "catConnection": "Verbindung",
+    "catGeneral": "Allgemein",
     "checkFailed": "Prüfung fehlgeschlagen: {{error}}",
     "checkUpdate": "Nach Updates suchen",
     "checkUpdateTitle": "GitHub auf die neueste Version prüfen (nur Erkennung, keine automatische Installation)",
diff --git a/apps/desktop/src/renderer/src/i18n/locales/en-US.json b/apps/desktop/src/renderer/src/i18n/locales/en-US.json
index 48b89e92..2f2833a4 100644
--- a/apps/desktop/src/renderer/src/i18n/locales/en-US.json
+++ b/apps/desktop/src/renderer/src/i18n/locales/en-US.json
@@ -636,6 +636,10 @@
     "cacheDirTitle": "Cache Directory",
     "cacheUsage": "Cache Usage",
     "calculating": "Calculating…",
+    "catAbout": "About",
+    "catAi": "AI",
+    "catConnection": "Connection",
+    "catGeneral": "General",
     "checkFailed": "Check failed: {{error}}",
     "checkUpdate": "Check for Updates",
     "checkUpdateTitle": "Check GitHub for the latest version (detection only, no auto-install)",
diff --git a/apps/desktop/src/renderer/src/i18n/locales/ja-JP.json b/apps/desktop/src/renderer/src/i18n/locales/ja-JP.json
index 2fc80f39..da1cddca 100644
--- a/apps/desktop/src/renderer/src/i18n/locales/ja-JP.json
+++ b/apps/desktop/src/renderer/src/i18n/locales/ja-JP.json
@@ -620,6 +620,10 @@
     "cacheDirTitle": "キャッシュディレクトリ",
     "cacheUsage": "キャッシュ使用量",
     "calculating": "計算中…",
+    "catAbout": "情報",
+    "catAi": "AI",
+    "catConnection": "接続",
+    "catGeneral": "一般",
     "checkFailed": "チェックに失敗しました：{{error}}",
     "checkUpdate": "アップデートを確認",
     "checkUpdateTitle": "GitHub で最新バージョンを確認（検出のみ、自動インストールなし）",
diff --git a/apps/desktop/src/renderer/src/i18n/locales/zh-CN.json b/apps/desktop/src/renderer/src/i18n/locales/zh-CN.json
index f16d2fbc..1f59c923 100644
--- a/apps/desktop/src/renderer/src/i18n/locales/zh-CN.json
+++ b/apps/desktop/src/renderer/src/i18n/locales/zh-CN.json
@@ -620,6 +620,10 @@
     "cacheDirTitle": "缓存目录",
     "cacheUsage": "缓存占用",
     "calculating": "计算中…",
+    "catAbout": "关于",
+    "catAi": "AI",
+    "catConnection": "连接",
+    "catGeneral": "常规",
     "checkFailed": "检查失败：{{error}}",
     "checkUpdate": "检查更新",
     "checkUpdateTitle": "查 GitHub 最新版本（仅检测，不自动安装）",
diff --git a/apps/desktop/src/renderer/src/styles/common/modal.scss b/apps/desktop/src/renderer/src/styles/common/modal.scss
index 8d2b2e17..91efe1cc 100644
--- a/apps/desktop/src/renderer/src/styles/common/modal.scss
+++ b/apps/desktop/src/renderer/src/styles/common/modal.scss
@@ -58,6 +58,14 @@
   overflow-y: auto;
 }
 
+// 宽尺寸：左右分区类模态（如 SettingsModal 分区导航 + 内容）需要更宽横向空间，
+// 让左导航与右侧内容各得其所。定高（受 .modal 的 max-height: 84vh 上限约束），
+// 使切换分区时模态尺寸恒定、右侧内容区独立滚动而非整体撑高。
+.modal-lg {
+  max-width: 880px;
+  height: 720px;
+}
+
 // ConfirmModal: 跟 SettingsModal 共用 .modal-backdrop/.modal/.modal-header，加几条
 // 小尺寸 + 底部操作行特化
 .modal-confirm {
diff --git a/apps/desktop/src/renderer/src/styles/features/settings/forms.scss b/apps/desktop/src/renderer/src/styles/features/settings/forms.scss
index 91352cd1..dc34ffc4 100644
--- a/apps/desktop/src/renderer/src/styles/features/settings/forms.scss
+++ b/apps/desktop/src/renderer/src/styles/features/settings/forms.scss
@@ -4,6 +4,76 @@
 @use '../../tokens' as *;
 @use '../../mixins' as *;
 
+// 配置面板左右分区：模态 body 去内边距、由本布局接管；左侧分区导航固定不滚，
+// 右侧分区内容独立滚动。分区结构为后续扩展（主题 / 编辑器 / 上下文窗口等）预留。
+.modal-body.settings-modal-body {
+  padding: 0;
+  overflow: hidden;
+  display: flex;
+  flex: 1;
+  min-height: 0;
+}
+.settings-layout {
+  display: flex;
+  flex: 1;
+  min-width: 0;
+  // 撑满定高模态（.modal-lg）：左导航固定、右面板独立滚动，不随分区内容增减高度
+  min-height: 0;
+}
+.settings-nav {
+  flex: 0 0 168px;
+  display: flex;
+  flex-direction: column;
+  gap: $space-1;
+  padding: $space-5 $space-4;
+  // 与模态主体同色（$bg-elev），仅以右侧分隔线区分导航区，避免色块割裂
+  border-right: 1px solid $border-default;
+  overflow-y: auto;
+}
+.settings-nav-item {
+  display: flex;
+  align-items: center;
+  gap: $space-3;
+  padding: $space-3 $space-4;
+  border: none;
+  border-radius: $radius-md;
+  background: transparent;
+  color: $text-body;
+  font-size: $fs-lg;
+  text-align: left;
+  cursor: pointer;
+
+  svg {
+    flex-shrink: 0;
+    color: $text-muted;
+  }
+
+  &:hover {
+    background: $bg-hover;
+  }
+
+  &.active {
+    background: $color-accent-bg-fade;
+    color: $text-primary;
+    font-weight: 500;
+
+    svg {
+      color: $color-accent;
+    }
+  }
+}
+.settings-panel {
+  flex: 1;
+  min-width: 0;
+  overflow-y: auto;
+  padding: $space-8;
+
+  // 分区内末个 section 去掉多余底部留白
+  .modal-section:last-child {
+    margin-bottom: 0;
+  }
+}
+
 // 语言下拉：固定宽度、靠右（块定位），文本左对齐；不被 .settings-input 的 flex:1 撑满（复合选择器提权）
 .settings-input.settings-language-select {
   flex: 0 0 auto;