diff --git a/app/src/main/java/com/hippo/ehviewer/ui/MainActivity.java b/app/src/main/java/com/hippo/ehviewer/ui/MainActivity.java
index f61cc67f2..40aef282a 100644
--- a/app/src/main/java/com/hippo/ehviewer/ui/MainActivity.java
+++ b/app/src/main/java/com/hippo/ehviewer/ui/MainActivity.java
@@ -29,6 +29,7 @@
 import android.support.design.widget.NavigationView;
 import android.support.design.widget.Snackbar;
 import android.support.v4.widget.DrawerLayout;
+import android.support.v7.app.AlertDialog;
 import android.text.TextUtils;
 import android.util.Log;
 import android.view.Gravity;
@@ -66,6 +67,7 @@
 import com.hippo.scene.Announcer;
 import com.hippo.scene.SceneFragment;
 import com.hippo.scene.StageActivity;
+import com.hippo.unifile.UniFile;
 import com.hippo.util.PermissionRequester;
 import com.hippo.widget.LoadImageView;
 import com.hippo.yorozuya.ViewUtils;
@@ -308,11 +310,24 @@ protected void onCreate2(@Nullable Bundle savedInstanceState) {
         if (savedInstanceState == null) {
             onInit();
             CommonOperations.checkUpdate(this, false);
+            checkDownloadLocation();
         } else {
             onRestore(savedInstanceState);
         }
     }
 
+    private void checkDownloadLocation() {
+        UniFile uniFile = Settings.getDownloadLocation();
+        if (null != uniFile && uniFile.ensureDir()) {
+            return;
+        }
+        new AlertDialog.Builder(this)
+                .setTitle(R.string.waring)
+                .setMessage(R.string.invalid_download_location)
+                .setPositiveButton(R.string.get_it, null)
+                .show();
+    }
+
     private void onInit() {
         // Check permission
         PermissionRequester.request(this, Manifest.permission.WRITE_EXTERNAL_STORAGE,
diff --git a/app/src/main/res/values-zh-rCN/strings.xml b/app/src/main/res/values-zh-rCN/strings.xml
index 8c53793ea..34aece1ff 100644
--- a/app/src/main/res/values-zh-rCN/strings.xml
+++ b/app/src/main/res/values-zh-rCN/strings.xml
@@ -46,6 +46,8 @@
     <string name="i_will_check_it">好的</string>
     <string name="i_dont_think_so">我没输错</string>
 
+    <string name="invalid_download_location">似乎下载路径不可用。请到重新设置下载路径。</string>
+
     <string name="error_bad_status_code">错误的状态码：%d</string>
     <string name="error_timeout">超时</string>
     <string name="error_unknown_host">未知主机</string>
diff --git a/app/src/main/res/values-zh-rHK/strings.xml b/app/src/main/res/values-zh-rHK/strings.xml
index 273a37d41..69708cc11 100644
--- a/app/src/main/res/values-zh-rHK/strings.xml
+++ b/app/src/main/res/values-zh-rHK/strings.xml
@@ -46,6 +46,8 @@
     <string name="i_will_check_it">好的</string>
     <string name="i_dont_think_so">我沒輸錯</string>
 
+    <string name="invalid_download_location">似乎下載路徑不可用。請到重新設置下載路徑。</string>
+
     <string name="error_bad_status_code">錯誤的狀態碼：%d</string>
     <string name="error_timeout">超時</string>
     <string name="error_unknown_host">未知主機</string>
diff --git a/app/src/main/res/values-zh-rTW/strings.xml b/app/src/main/res/values-zh-rTW/strings.xml
index 2a0e0f1a6..a64c90cf7 100644
--- a/app/src/main/res/values-zh-rTW/strings.xml
+++ b/app/src/main/res/values-zh-rTW/strings.xml
@@ -46,6 +46,8 @@
     <string name="i_will_check_it">好的</string>
     <string name="i_dont_think_so">我沒輸錯</string>
 
+    <string name="invalid_download_location">似乎下載路徑不可用。請到重新設定下載路徑。</string>
+
     <string name="error_bad_status_code">錯誤的狀態碼：%d</string>
     <string name="error_timeout">超時</string>
     <string name="error_unknown_host">未知主機</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 04450eb37..6df4514d2 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -62,6 +62,8 @@
     <string name="i_will_check_it">I will check it</string>
     <string name="i_dont_think_so">I don\'t think so</string>
 
+    <string name="invalid_download_location">It seems download location is not available. Please set it in Settings.</string>
+
     <string name="error_status_code_400" translatable="false">Bad Request</string>
     <string name="error_status_code_401" translatable="false">Unauthorized</string>
     <string name="error_status_code_402" translatable="false">Payment Required</string>