diff --git a/app/src/main/java/com/shatyuka/zhiliao/Hooks.java b/app/src/main/java/com/shatyuka/zhiliao/Hooks.java
index 3491499..5b9ec23 100644
--- a/app/src/main/java/com/shatyuka/zhiliao/Hooks.java
+++ b/app/src/main/java/com/shatyuka/zhiliao/Hooks.java
@@ -23,6 +23,7 @@
 import com.shatyuka.zhiliao.hooks.NavButton;
 import com.shatyuka.zhiliao.hooks.NavRes;
 import com.shatyuka.zhiliao.hooks.NextAnswer;
+import com.shatyuka.zhiliao.hooks.FullScreen;
 import com.shatyuka.zhiliao.hooks.RedDot;
 import com.shatyuka.zhiliao.hooks.SearchAd;
 import com.shatyuka.zhiliao.hooks.ShareAd;
@@ -66,6 +67,7 @@ public class Hooks {
             new HeadZoneBanner(),
             new MineHybridView(),
             new FollowButton(),
+            new FullScreen(),
     };
 
     public static void init(final ClassLoader classLoader) {
diff --git a/app/src/main/java/com/shatyuka/zhiliao/hooks/FullScreen.java b/app/src/main/java/com/shatyuka/zhiliao/hooks/FullScreen.java
new file mode 100644
index 0000000..99941ad
--- /dev/null
+++ b/app/src/main/java/com/shatyuka/zhiliao/hooks/FullScreen.java
@@ -0,0 +1,37 @@
+package com.shatyuka.zhiliao.hooks;
+
+import com.shatyuka.zhiliao.Helper;
+
+import de.robv.android.xposed.XC_MethodHook;
+import de.robv.android.xposed.XposedHelpers;
+
+public class FullScreen implements IHook {
+    static Class<?> ClearScreenHelper_lambda;
+
+    @Override
+    public String getName() {
+        return "禁止进入全屏模式";
+    }
+
+    @Override
+    public void init(ClassLoader classLoader) throws Throwable {
+        try {
+            ClearScreenHelper_lambda = classLoader.loadClass("com.zhihu.android.feature.short_container_feature.ui.widget.toolbar.clearscreen.d$c");
+        } catch (ClassNotFoundException ignored) {
+        }
+    }
+
+    @Override
+    public void hook() throws Throwable {
+        if (ClearScreenHelper_lambda != null) {
+            XposedHelpers.findAndHookMethod(ClearScreenHelper_lambda, "invoke", new XC_MethodHook() {
+                @Override
+                protected void beforeHookedMethod(MethodHookParam param) {
+                    if (Helper.prefs.getBoolean("switch_fullscreen", false)) {
+                        param.setResult(null);
+                    }
+                }
+            });
+        }
+    }
+}
diff --git a/app/src/main/java/com/shatyuka/zhiliao/hooks/ZhihuPreference.java b/app/src/main/java/com/shatyuka/zhiliao/hooks/ZhihuPreference.java
index c0288ea..8cef249 100644
--- a/app/src/main/java/com/shatyuka/zhiliao/hooks/ZhihuPreference.java
+++ b/app/src/main/java/com/shatyuka/zhiliao/hooks/ZhihuPreference.java
@@ -492,6 +492,7 @@ protected Object replaceHookedMethod(MethodHookParam param) throws Throwable {
                 setIcon.invoke(findPreference.invoke(thisObject, "switch_colormode"), Helper.modRes.getDrawable(R.drawable.ic_color));
                 setIcon.invoke(switch_tag, Helper.modRes.getDrawable(R.drawable.ic_label));
                 setIcon.invoke(findPreference.invoke(thisObject, "switch_statusbar"), Helper.modRes.getDrawable(R.drawable.ic_fullscreen));
+                setIcon.invoke(findPreference.invoke(thisObject, "switch_fullscreen"), Helper.modRes.getDrawable(R.drawable.ic_fullscreen_exit));
                 setIcon.invoke(switch_thirdpartylogin, Helper.modRes.getDrawable(R.drawable.ic_login));
                 setIcon.invoke(switch_livebutton, Helper.modRes.getDrawable(R.drawable.ic_live_tv));
                 setIcon.invoke(switch_reddot, Helper.modRes.getDrawable(R.drawable.ic_mark_chat_unread));
diff --git a/app/src/main/res/drawable/ic_fullscreen_exit.xml b/app/src/main/res/drawable/ic_fullscreen_exit.xml
new file mode 100644
index 0000000..1c2e25f
--- /dev/null
+++ b/app/src/main/res/drawable/ic_fullscreen_exit.xml
@@ -0,0 +1,3 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android" android:height="24dp" android:tint="#808080" android:viewportHeight="24" android:viewportWidth="24" android:width="24dp">
+    <path android:fillColor="@android:color/white" android:pathData="M5,16h3v3h2v-5L5,14v2zM8,8L5,8v2h5L10,5L8,5v3zM14,19h2v-3h3v-2h-5v5zM16,8L16,5h-2v5h5L19,8h-3z"/>
+</vector>
diff --git a/app/src/main/res/xml/preferences_zhihu.xml b/app/src/main/res/xml/preferences_zhihu.xml
index 431a77c..dfc37a5 100644
--- a/app/src/main/res/xml/preferences_zhihu.xml
+++ b/app/src/main/res/xml/preferences_zhihu.xml
@@ -143,6 +143,12 @@
             android:key="switch_statusbar"
             android:title="状态栏沉浸"
             android:summary="沉浸式状态栏"/>
+        <com.zhihu.android.app.ui.widget.SwitchPreference
+            android:defaultValue="false"
+            android:dependency="switch_mainswitch"
+            android:key="switch_fullscreen"
+            android:title="禁止进入全屏模式"
+            android:summary="看看时间"/>
         <com.zhihu.android.app.ui.widget.SwitchPreference
             android:defaultValue="false"
             android:dependency="switch_mainswitch"
diff --git a/app/src/test/java/com/shatyuka/zhiliao/HookTest.java b/app/src/test/java/com/shatyuka/zhiliao/HookTest.java
index ce97eed..54a6b34 100644
--- a/app/src/test/java/com/shatyuka/zhiliao/HookTest.java
+++ b/app/src/test/java/com/shatyuka/zhiliao/HookTest.java
@@ -8,6 +8,7 @@
 import com.shatyuka.zhiliao.hooks.FeedAd;
 import com.shatyuka.zhiliao.hooks.FeedTopHotBanner;
 import com.shatyuka.zhiliao.hooks.FollowButton;
+import com.shatyuka.zhiliao.hooks.FullScreen;
 import com.shatyuka.zhiliao.hooks.HeadZoneBanner;
 import com.shatyuka.zhiliao.hooks.Horizontal;
 import com.shatyuka.zhiliao.hooks.HotBanner;
@@ -206,4 +207,9 @@ public void mineHybridViewTest() {
     public void followButtonTest() {
         checkHook(new FollowButton());
     }
+
+    @Test
+    public void fullScreen() {
+        checkHook(new FullScreen());
+    }
 }