diff --git a/platformthemeplugin/qdeepintheme.cpp b/platformthemeplugin/qdeepintheme.cpp
index 7af14492..b3862509 100644
--- a/platformthemeplugin/qdeepintheme.cpp
+++ b/platformthemeplugin/qdeepintheme.cpp
@@ -656,6 +656,14 @@ const QPalette *QDeepinTheme::palette(QPlatformTheme::Palette type) const
     return &palette;
 }
 
+static QFont *createUnresolveFont(const QString &family, qreal pointSize)
+{
+    auto font = new QFont(family);
+    font->setPointSizeF(pointSize);
+    setResolveMask(*font, QFont::NoPropertiesResolved);
+    return font;
+}
+
 const QFont *QDeepinTheme::font(QPlatformTheme::Font type) const
 {
     if (!qApp->desktopSettingsAware())
@@ -667,12 +675,16 @@ const QFont *QDeepinTheme::font(QPlatformTheme::Font type) const
             QByteArray font_name = theme->fontName();
             qreal font_size = 0;
 
+            static QScopedPointer<QFont> sysFont;
             if (font_name.isEmpty()) {
                 font_name = theme->gtkFontName();
                 int font_size_index = font_name.lastIndexOf(' ');
 
-                if (font_size_index <= 0)
-                    break;
+                if (font_size_index <= 0) {
+                    const QFont *defaultFont = QGenericUnixTheme::font(type);
+                    sysFont.reset(createUnresolveFont(defaultFont->family(), defaultFont->pointSizeF()));
+                    return sysFont.data();
+                }
 
                 font_size = font_name.mid(font_size_index + 1).toDouble();
                 font_name = font_name.left(font_size_index);
@@ -684,13 +696,8 @@ const QFont *QDeepinTheme::font(QPlatformTheme::Font type) const
                 font_size = 10.5;
             }
 
-            static QScopedPointer<QFont> sysFont;
-
             // We need to re-contruct a new QFont each time, inorder to refresh font dpi
-            sysFont.reset(new QFont(QString()));
-            sysFont->setFamily(font_name);
-            sysFont->setPointSizeF(font_size);
-            setResolveMask(*sysFont, QFont::NoPropertiesResolved);
+            sysFont.reset(createUnresolveFont(font_name, font_size));
 
             return sysFont.data();
         }
@@ -700,8 +707,11 @@ const QFont *QDeepinTheme::font(QPlatformTheme::Font type) const
         if (DPlatformTheme *theme = appTheme()) {
             QByteArray font_name = theme->monoFontName();
 
+            static QScopedPointer<QFont> fixedFont;
             if (font_name.isEmpty()) {
-                break;
+                const QFont *defaultFont = QGenericUnixTheme::font(type);
+                fixedFont.reset(createUnresolveFont(defaultFont->family(), defaultFont->pointSizeF()));
+                return fixedFont.data();
             }
 
             qreal font_size = theme->fontPointSize();
@@ -710,13 +720,8 @@ const QFont *QDeepinTheme::font(QPlatformTheme::Font type) const
                 font_size = 10.5;
             }
 
-            static QScopedPointer<QFont> fixedFont;
-
             // We need to re-contruct a new QFont each time, inorder to refresh font dpi
-            fixedFont.reset(new QFont(QString()));
-            fixedFont->setFamily(font_name);
-            fixedFont->setPointSizeF(font_size);
-            setResolveMask(*fixedFont, QFont::NoPropertiesResolved);
+            fixedFont.reset(createUnresolveFont(font_name, font_size));
 
             return fixedFont.data();
         }