diff --git a/src/controls/tabbar.cpp b/src/controls/tabbar.cpp
index e3982396..1cd425ba 100644
--- a/src/controls/tabbar.cpp
+++ b/src/controls/tabbar.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2017 - 2023 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2017 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -59,6 +59,10 @@ Tabbar::Tabbar(QWidget *parent)
 
     installEventFilter(this);
 
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+    qApp->installEventFilter(this);
+#endif
+
     setMovable(true);
     setTabsClosable(true);
     setVisibleAddButton(true);
@@ -606,7 +610,12 @@ void Tabbar::handleDragActionChanged(Qt::DropAction action)
 
 bool Tabbar::eventFilter(QObject *, QEvent *event)
 {
-    qDebug() << "Enter eventFilter";
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+    if (event->type() == QEvent::ApplicationFontChange) {
+        setFont(qApp->font());
+        return false;
+    }
+#endif
     if (event->type() == QEvent::MouseButtonPress) {
         QMouseEvent *mouseEvent = static_cast<QMouseEvent *>(event);
 
diff --git a/src/widgets/bottombar.cpp b/src/widgets/bottombar.cpp
index 07514307..b6b29193 100644
--- a/src/widgets/bottombar.cpp
+++ b/src/widgets/bottombar.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2017 - 2023 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2017 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -56,6 +56,10 @@ BottomBar::BottomBar(QWidget *parent)
     DFontSizeManager::instance()->bind(m_scaleLabel, DFontSizeManager::T9);
     DFontSizeManager::instance()->bind(m_progressLabel, DFontSizeManager::T9);
 
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+    qApp->installEventFilter(this);
+#endif
+
     initFormatMenu();
 
     QHBoxLayout *layout = new QHBoxLayout(this);
@@ -281,6 +285,22 @@ DDropdownMenu *BottomBar::getHighlightMenu()
     return m_pHighlightMenu;
 }
 
+bool BottomBar::eventFilter(QObject *watched, QEvent *event)
+{
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+    if (event->type() == QEvent::ApplicationFontChange) {
+        QFont font = qApp->font();
+        m_pPositionLabel->setFont(font);
+        m_pCharCountLabel->setFont(font);
+        m_pCursorStatus->setFont(font);
+        m_scaleLabel->setFont(font);
+        m_progressLabel->setFont(font);
+        return false;
+    }
+#endif
+    return QWidget::eventFilter(watched, event);
+}
+
 void BottomBar::paintEvent(QPaintEvent *)
 {
     QPainter painter(this);
diff --git a/src/widgets/bottombar.h b/src/widgets/bottombar.h
index e9a71e13..52f9e0b3 100644
--- a/src/widgets/bottombar.h
+++ b/src/widgets/bottombar.h
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2017 - 2023 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2017 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -53,6 +53,7 @@ class BottomBar : public QWidget
 
 protected:
     void paintEvent(QPaintEvent *);
+    bool eventFilter(QObject *, QEvent *) override;
 
 private:
     void initFormatMenu();
diff --git a/src/widgets/ddropdownmenu.cpp b/src/widgets/ddropdownmenu.cpp
index 425f965c..8d36e310 100644
--- a/src/widgets/ddropdownmenu.cpp
+++ b/src/widgets/ddropdownmenu.cpp
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2017 - 2023 UnionTech Software Technology Co., Ltd.
+// SPDX-FileCopyrightText: 2017 - 2026 UnionTech Software Technology Co., Ltd.
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -494,8 +494,11 @@ void DDropdownMenu::OnFontChangedSlot(const QFont &font)
 {
     qDebug() << "DDropdownMenu OnFontChangedSlot";
     m_font = font;
-    int fontsize =DFontSizeManager::instance()->fontPixelSize(DFontSizeManager::T8);
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
+    int fontsize = DFontSizeManager::instance()->fontPixelSize(DFontSizeManager::T8);
     m_font.setPixelSize(fontsize);
+#endif
+    m_pToolButton->setFont(m_font);
     m_pToolButton->setIcon(createIcon());
     qDebug() << "DDropdownMenu OnFontChangedSlot end";
 }
@@ -508,8 +511,7 @@ bool DDropdownMenu::eventFilter(QObject *object, QEvent *event)
         // 处理字体变化
         QFont font = qApp->font(); // 获取当前应用程序字体
         OnFontChangedSlot(font);   // 调用槽函数更新字体
-        qDebug() << "DDropdownMenu eventFilter ApplicationFontChange, return true";
-        return true;
+        return false;
     }
 #endif