diff --git a/src/common/appmanagercommon.cpp b/src/common/appmanagercommon.cpp
index 08aa8c01035bccdbdc520188016f6ccb52fcfe3e..8515ef4c378821a86d1a29635a9fcb74ab530d49 100644
--- a/src/common/appmanagercommon.cpp
+++ b/src/common/appmanagercommon.cpp
@@ -104,3 +104,18 @@ bool AM::judgePkgIsInstalledFromStr(const QString &str)
 {
     return str.contains("installed") && !str.contains("not-installed");
 }
+
+bool AM::isQGSettingsContainsKey(const QGSettings &settings, const QString &key)
+{
+    const QString simplyfiedKey = QString(key).toLower().remove(".").remove("-").remove("_");
+    const QStringList keys = settings.keys();
+    for (QStringList::const_iterator cIter = keys.begin(); cIter != keys.end(); ++cIter) {
+        QString originKey = *cIter;
+        originKey = originKey.toLower().remove(".").remove("-").remove("_");
+        if (originKey == simplyfiedKey) {
+            return true;
+        }
+    }
+
+    return false;
+}
diff --git a/src/common/appmanagercommon.h b/src/common/appmanagercommon.h
index e2e21e11a1459b959a2ce2f424d04391cfda94ab..f703fcdc7d15ecd720c09fa8fd96cee90dc4b4b7 100644
--- a/src/common/appmanagercommon.h
+++ b/src/common/appmanagercommon.h
@@ -2,6 +2,8 @@
 
 #include <DStyleOption>
 
+#include <QGSettings/QGSettings>
+
 #define ONLY_SHOW_IN_VALUE_DEEPIN "Deepin"
 #define X_DEEPIN_VENDOR_STR "deepin"
 // 应用默认图标
@@ -101,4 +103,6 @@ void popupNormalSysNotify(const QString &summary, const QString &body);
 QString formatBytes(qint64 input, int prec);
 // 从状态字符串中判断包是否已安装
 bool judgePkgIsInstalledFromStr(const QString &str);
+// 判断GSettings中是否包含指定键
+bool isQGSettingsContainsKey(const QGSettings &settings, const QString &key);
 } // namespace AM
diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index 9b77f6c7165c5f6b4fa69d5e90057f0a48ce0a2d..9b02c6a1fc654116212d69e5b5b6f10f2a50d235 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -6,11 +6,12 @@
 #include <DApplicationHelper>
 #include <DSysInfo>
 #include <DDialog>
+
 #include <QTextEdit>
 #include <QProcess>
-
 #include <QHBoxLayout>
 #include <QGSettings/QGSettings>
+#include <QScreen>
 
 MainWindow::MainWindow(QWidget *parent)
     : DMainWindow(parent)
@@ -20,7 +21,10 @@ MainWindow::MainWindow(QWidget *parent)
     , m_appManagerWidget(nullptr)
 {
     setMinimumSize(500, 300);
-    resize(1000, 600);
+    QRect primaryScreenGeometry = qApp->primaryScreen()->geometry();
+    int resizedWidth = int(primaryScreenGeometry.width() * 0.7);
+    int resizedHeight = int(resizedWidth * 3 / 5);
+    resize(resizedWidth, resizedHeight);
     // 设置背景
     setTitlebarShadowEnabled(false);
     setFocusPolicy(Qt::FocusPolicy::ClickFocus);
@@ -58,7 +62,7 @@ MainWindow::MainWindow(QWidget *parent)
     int dtkWindowRadius = 8;
     if (QGSettings::isSchemaInstalled("com.deepin.xsettings")) {
         QGSettings deepinSettings("com.deepin.xsettings");
-        if (deepinSettings.keys().contains("dtk-window-radius")) {
+        if (AM::isQGSettingsContainsKey(deepinSettings, "dtk-window-radius")) {
             dtkWindowRadius = deepinSettings.get("dtk-window-radius").toInt();
         }
     }