diff --git a/panels/dock/taskmanager/taskmanager.cpp b/panels/dock/taskmanager/taskmanager.cpp
index d13cb962f..5411b2576 100644
--- a/panels/dock/taskmanager/taskmanager.cpp
+++ b/panels/dock/taskmanager/taskmanager.cpp
@@ -152,6 +152,14 @@ bool TaskManager::init()
         m_windowFullscreen = isFullscreen;
         emit windowFullscreenChanged(isFullscreen);
     });
+
+    // 设置preview opacity
+    DS_NAMESPACE::DAppletBridge appearanceBridge("org.deepin.ds.dde-appearance");
+    auto appearanceApplet = appearanceBridge.applet();
+    if (appearanceApplet) {
+        modifyOpacityChanged();
+        connect(appearanceApplet, SIGNAL(opacityChanged()), this, SLOT(modifyOpacityChanged()));
+    }
     return true;
 }
 
@@ -418,6 +426,19 @@ void TaskManager::activateWindow(uint32_t windowID)
 #endif
 }
 
+void TaskManager::modifyOpacityChanged()
+{
+    DS_NAMESPACE::DAppletBridge appearanceBridge("org.deepin.ds.dde-appearance");
+    auto appearanceApplet = appearanceBridge.applet();
+    if (appearanceApplet) {
+        double opacity = appearanceApplet->property("opacity").toReal();
+        auto x11Monitor = qobject_cast<X11WindowMonitor*>(m_windowMonitor.data());
+        x11Monitor->setPreviewOpacity(opacity);
+    }else{
+        qWarning() << "modifyOpacityChanged: appearanceApplet is null";
+    }
+}
+
 D_APPLET_CLASS(TaskManager)
 }
 
diff --git a/panels/dock/taskmanager/taskmanager.h b/panels/dock/taskmanager/taskmanager.h
index 731b929d5..549c5bc97 100644
--- a/panels/dock/taskmanager/taskmanager.h
+++ b/panels/dock/taskmanager/taskmanager.h
@@ -109,6 +109,7 @@ class TaskManager : public DS_NAMESPACE::DContainment, public AbstractTaskManage
 
 private Q_SLOTS:
     void handleWindowAdded(QPointer<AbstractWindow> window);
+    void modifyOpacityChanged();
 
 private:
     void loadDockedAppItems();
diff --git a/panels/dock/taskmanager/x11windowmonitor.cpp b/panels/dock/taskmanager/x11windowmonitor.cpp
index ef070f9e2..bf3fa9bc5 100644
--- a/panels/dock/taskmanager/x11windowmonitor.cpp
+++ b/panels/dock/taskmanager/x11windowmonitor.cpp
@@ -45,6 +45,7 @@ bool XcbEventFilter::nativeEventFilter(const QByteArray &eventType, void *messag
 
 X11WindowMonitor::X11WindowMonitor(QObject* parent)
     : AbstractWindowMonitor(parent)
+    , m_opacity(0.2)
 {
     monitor = this;
     connect(this, &X11WindowMonitor::windowMapped, this, &X11WindowMonitor::onWindowMapped);
@@ -109,6 +110,7 @@ void X11WindowMonitor::showItemPreview(const QPointer<AppItem> &item, QObject* r
 
     if (m_windowPreview.isNull()) {
         m_windowPreview.reset(new X11WindowPreviewContainer(this));
+        m_windowPreview->setMaskAlpha(static_cast<int>(m_opacity * 255));
         m_windowPreview->windowHandle()->setTransientParent(qobject_cast<QWindow *>(relativePositionItem));
     }
 
@@ -141,6 +143,14 @@ void X11WindowMonitor::cancelPreviewWindow()
             .call().waitForFinished();
 }
 
+void X11WindowMonitor::setPreviewOpacity(double opacity)
+{
+    m_opacity = opacity;
+    if (!m_windowPreview.isNull()) {
+        m_windowPreview->setMaskAlpha(static_cast<int>(m_opacity * 255));
+    }
+}
+
 void X11WindowMonitor::onWindowMapped(xcb_window_t xcb_window)
 {
     auto window = m_windows.value(xcb_window, nullptr);
diff --git a/panels/dock/taskmanager/x11windowmonitor.h b/panels/dock/taskmanager/x11windowmonitor.h
index 74c54f982..3a5e7fa84 100644
--- a/panels/dock/taskmanager/x11windowmonitor.h
+++ b/panels/dock/taskmanager/x11windowmonitor.h
@@ -41,6 +41,7 @@ class X11WindowMonitor : public AbstractWindowMonitor
     virtual void hideItemPreview() override;
     void previewWindow(uint32_t winId);
     void cancelPreviewWindow();
+    void setPreviewOpacity(double opacity);
 
 Q_SIGNALS:
     void windowMapped(xcb_window_t window);
@@ -62,5 +63,7 @@ private Q_SLOTS:
     QScopedPointer<XcbEventFilter> m_xcbEventFilter;
     QScopedPointer<X11WindowPreviewContainer> m_windowPreview;
     QHash<xcb_window_t, QSharedPointer<X11Window>> m_windows;
+    double m_opacity;
+
 };
 }