diff --git a/app/src/main/java/com/github/tvbox/osc/event/RefreshEvent.java b/app/src/main/java/com/github/tvbox/osc/event/RefreshEvent.java
index e0ed2860..fc07783b 100644
--- a/app/src/main/java/com/github/tvbox/osc/event/RefreshEvent.java
+++ b/app/src/main/java/com/github/tvbox/osc/event/RefreshEvent.java
@@ -18,6 +18,7 @@ public class RefreshEvent {
     public static final int TYPE_PUSH_URL = 9;
     public static final int TYPE_EPG_URL_CHANGE = 10;
     public static final int TYPE_SETTING_SEARCH_TV = 11;
+    public static final int TYPE_SUBTITLE_SIZE_CHANGE = 12;
     public int type;
     public Object obj;
 
diff --git a/app/src/main/java/com/github/tvbox/osc/ui/activity/DetailActivity.java b/app/src/main/java/com/github/tvbox/osc/ui/activity/DetailActivity.java
index 1e7e4e2a..90a5a4d3 100644
--- a/app/src/main/java/com/github/tvbox/osc/ui/activity/DetailActivity.java
+++ b/app/src/main/java/com/github/tvbox/osc/ui/activity/DetailActivity.java
@@ -47,6 +47,7 @@ import com.github.tvbox.osc.util.HawkConfig;
 import com.github.tvbox.osc.util.LOG;
 import com.github.tvbox.osc.util.MD5;
 import com.github.tvbox.osc.util.SearchHelper;
+import com.github.tvbox.osc.util.SubtitleHelper;
 import com.github.tvbox.osc.viewmodel.SourceViewModel;
 import com.google.gson.Gson;
 import com.google.gson.JsonArray;
@@ -652,6 +653,7 @@ public class DetailActivity extends BaseActivity {
                             llPlayerFragmentContainer.setVisibility(View.VISIBLE);
                             llPlayerFragmentContainerBlock.setVisibility(View.VISIBLE);
                             llPlayerFragmentContainerBlock.requestFocus();
+                            toggleSubtitleTextSize();
                         }
                         // startQuickSearch();
                     } else {
@@ -934,5 +936,16 @@ public class DetailActivity extends BaseActivity {
         tvSort.setFocusable(!fullWindows);
         tvCollect.setFocusable(!fullWindows);
         tvQuickSearch.setFocusable(!fullWindows);
+        toggleSubtitleTextSize();
+    }
+
+    void toggleSubtitleTextSize() {
+        int subtitleTextSize;
+        if (fullWindows) {
+            subtitleTextSize = SubtitleHelper.getTextSize(this);
+        } else {
+            subtitleTextSize = SubtitleHelper.getSubtitleTextAutoSize(this);
+        }
+        EventBus.getDefault().post(new RefreshEvent(RefreshEvent.TYPE_SUBTITLE_SIZE_CHANGE, subtitleTextSize));
     }
 }
diff --git a/app/src/main/java/com/github/tvbox/osc/ui/fragment/PlayFragment.java b/app/src/main/java/com/github/tvbox/osc/ui/fragment/PlayFragment.java
index 87dc6b19..cdeef2b4 100644
--- a/app/src/main/java/com/github/tvbox/osc/ui/fragment/PlayFragment.java
+++ b/app/src/main/java/com/github/tvbox/osc/ui/fragment/PlayFragment.java
@@ -77,6 +77,8 @@ import com.obsez.android.lib.filechooser.ChooserDialog;
 import com.orhanobut.hawk.Hawk;
 
 import org.greenrobot.eventbus.EventBus;
+import org.greenrobot.eventbus.Subscribe;
+import org.greenrobot.eventbus.ThreadMode;
 import org.jetbrains.annotations.NotNull;
 import org.json.JSONException;
 import org.json.JSONObject;
@@ -123,6 +125,13 @@ public class PlayFragment extends BaseLazyFragment {
         return R.layout.activity_play;
     }
 
+    @Subscribe(threadMode = ThreadMode.MAIN)
+    public void refresh(RefreshEvent event) {
+        if (event.type == RefreshEvent.TYPE_SUBTITLE_SIZE_CHANGE) {
+            mController.mSubtitleView.setTextSize((int) event.obj);
+        }
+    }
+
     @Override
     protected void init() {
         initView();
@@ -131,6 +140,7 @@ public class PlayFragment extends BaseLazyFragment {
     }
 
     private void initView() {
+        EventBus.getDefault().register(this);
         mHandler = new Handler(new Handler.Callback() {
             @Override
             public boolean handleMessage(@NonNull Message msg) {