diff --git a/panels/dock/dockhelper.cpp b/panels/dock/dockhelper.cpp
index 28eb9f07c..73b82e998 100644
--- a/panels/dock/dockhelper.cpp
+++ b/panels/dock/dockhelper.cpp
@@ -45,6 +45,13 @@ DockHelper::DockHelper(DockPanel *parent)
             m_showTimer->start();
         }
     });
+    connect(this, &DockHelper::currentActiveWindowFullscreenChanged, this, [this] (bool isFullscreen) {
+        if (isFullscreen) {
+            checkNeedHideOrNot();
+        } else {
+            checkNeedShowOrNot();
+        }
+    });
 }
 
 bool DockHelper::eventFilter(QObject *watched, QEvent *event)
@@ -154,8 +161,8 @@ void DockHelper::checkNeedHideOrNot()
     bool needHide;
     switch (parent()->hideMode()) {
     case KeepShowing: {
-        // KeepShow. current activeWindow is maximized.
-        needHide = currentActiveWindowMaximized();
+        // KeepShow. current activeWindow is fullscreend.
+        needHide = currentActiveWindowFullscreened();
         break;
     }
     case SmartHide: {
@@ -184,8 +191,8 @@ void DockHelper::checkNeedShowOrNot()
     bool needShow;
     switch (parent()->hideMode()) {
     case KeepShowing: {
-        // KeepShow. currentWindow is not maximized.
-        needShow = !currentActiveWindowMaximized();
+        // KeepShow. currentWindow is not fullscreened.
+        needShow = !currentActiveWindowFullscreened();
         break;
     }
     case SmartHide: {
diff --git a/panels/dock/dockhelper.h b/panels/dock/dockhelper.h
index 123b5fc59..f1019de0b 100644
--- a/panels/dock/dockhelper.h
+++ b/panels/dock/dockhelper.h
@@ -24,14 +24,14 @@ class DockHelper : public QObject
 
 Q_SIGNALS:
     void isWindowOverlapChanged(bool overlap);
-    void currentActiveWindowMaximizedChanged(bool maximized);
+    void currentActiveWindowFullscreenChanged(bool fullscreen);
 
 protected:
     DockPanel *parent();
     [[nodiscard]] virtual DockWakeUpArea *createArea(QScreen *screen) = 0;
     virtual void destroyArea(DockWakeUpArea *area) = 0;
 
-    virtual bool currentActiveWindowMaximized() = 0;
+    virtual bool currentActiveWindowFullscreened() = 0;
     virtual bool isWindowOverlap() = 0;
 
 private:
diff --git a/panels/dock/taskmanager/abstractwindowmonitor.h b/panels/dock/taskmanager/abstractwindowmonitor.h
index 527e93086..b87528ce0 100644
--- a/panels/dock/taskmanager/abstractwindowmonitor.h
+++ b/panels/dock/taskmanager/abstractwindowmonitor.h
@@ -40,6 +40,8 @@ class AbstractWindowMonitor : public QAbstractListModel
 
 Q_SIGNALS:
     void windowAdded(QPointer<AbstractWindow> window);
+    // true -> At least one window is at fullscreen state. false -> none of the windows is at fullscreen state.
+    void windowFullscreenChanged(bool);
     void WindowMonitorShutdown();
 
 private:
diff --git a/panels/dock/taskmanager/taskmanager.cpp b/panels/dock/taskmanager/taskmanager.cpp
index 799c7328d..fe8206c6b 100644
--- a/panels/dock/taskmanager/taskmanager.cpp
+++ b/panels/dock/taskmanager/taskmanager.cpp
@@ -40,6 +40,7 @@ namespace dock {
 
 TaskManager::TaskManager(QObject* parent)
     : DContainment(parent)
+    , m_windowFullscreen(false)
 {
     qRegisterMetaType<ObjectInterfaceMap>();
     qDBusRegisterMetaType<ObjectInterfaceMap>();
@@ -110,6 +111,11 @@ bool TaskManager::init()
 
     if (m_windowMonitor)
         m_windowMonitor->start();
+
+    connect(m_windowMonitor.data(), &AbstractWindowMonitor::windowFullscreenChanged, this, [this] (bool isFullscreen) {
+        m_windowFullscreen = isFullscreen;
+        emit windowFullscreenChanged(isFullscreen);
+    });
     return true;
 }
 
@@ -299,6 +305,11 @@ bool TaskManager::windowSplit()
     return Settings->isWindowSplit();
 }
 
+bool TaskManager::windowFullscreen()
+{
+    return m_windowFullscreen;
+}
+
 D_APPLET_CLASS(TaskManager)
 }
 
diff --git a/panels/dock/taskmanager/taskmanager.h b/panels/dock/taskmanager/taskmanager.h
index 1e41ad7af..0eeb6240e 100644
--- a/panels/dock/taskmanager/taskmanager.h
+++ b/panels/dock/taskmanager/taskmanager.h
@@ -21,6 +21,7 @@ class TaskManager : public DS_NAMESPACE::DContainment
     Q_PROPERTY(ItemModel* dataModel READ dataModel NOTIFY dataModelChanged)
 
     Q_PROPERTY(bool windowSplit READ windowSplit NOTIFY windowSplitChanged)
+    Q_PROPERTY(bool windowFullscreen READ windowFullscreen NOTIFY windowFullscreenChanged)
     Q_PROPERTY(bool allowForceQuit READ allowForceQuit NOTIFY allowedForceQuitChanged)
 
 public:
@@ -32,6 +33,7 @@ class TaskManager : public DS_NAMESPACE::DContainment
     virtual bool load() override;
 
     bool windowSplit();
+    bool windowFullscreen();
     bool allowForceQuit();
 
     Q_INVOKABLE QString desktopIdToAppId(const QString& desktopId);
@@ -49,6 +51,7 @@ class TaskManager : public DS_NAMESPACE::DContainment
 Q_SIGNALS:
     void dataModelChanged();
     void windowSplitChanged();
+    void windowFullscreenChanged(bool);
     void allowedForceQuitChanged();
 
 private Q_SLOTS:
@@ -60,6 +63,7 @@ private Q_SLOTS:
 private:
     QScopedPointer<AbstractWindowMonitor> m_windowMonitor;
     RoleCombineModel *m_activeAppModel = nullptr;
+    bool m_windowFullscreen;
 };
 
 }
diff --git a/panels/dock/taskmanager/treelandwindow.cpp b/panels/dock/taskmanager/treelandwindow.cpp
index e38cec87a..ff556f920 100644
--- a/panels/dock/taskmanager/treelandwindow.cpp
+++ b/panels/dock/taskmanager/treelandwindow.cpp
@@ -160,6 +160,11 @@ bool TreeLandWindow::isMinimized()
     return m_foreignToplevelHandle->state().contains(Minimized);
 }
 
+bool TreeLandWindow::isFullscreen()
+{
+    return m_foreignToplevelHandle->state().contains(Fullscreen);
+}
+
 bool TreeLandWindow::allowClose()
 {
     return true;
diff --git a/panels/dock/taskmanager/treelandwindow.h b/panels/dock/taskmanager/treelandwindow.h
index e984306c1..4155b7ed2 100644
--- a/panels/dock/taskmanager/treelandwindow.h
+++ b/panels/dock/taskmanager/treelandwindow.h
@@ -81,6 +81,7 @@ class TreeLandWindow : public AbstractWindow
     bool isActive() override;
     bool shouldSkip() override;
     bool isMinimized() override;
+    bool isFullscreen();
     bool allowClose() override;
     bool isAttention() override;
 
diff --git a/panels/dock/taskmanager/treelandwindowmonitor.cpp b/panels/dock/taskmanager/treelandwindowmonitor.cpp
index e972ac8b6..25f9142fe 100644
--- a/panels/dock/taskmanager/treelandwindowmonitor.cpp
+++ b/panels/dock/taskmanager/treelandwindowmonitor.cpp
@@ -79,6 +79,7 @@ void TreeLandDockPreviewContext::treeland_dock_preview_context_v1_leave()
 
 TreeLandWindowMonitor::TreeLandWindowMonitor(QObject* parent)
     :AbstractWindowMonitor(parent)
+    , m_fullscreenState(false)
 {
 }
 
@@ -170,6 +171,20 @@ void TreeLandWindowMonitor::handleForeignToplevelHandleAdded()
         m_windows.insert(id, window);
     }
 
+    connect(window.data(), &AbstractWindow::stateChanged, this, [=] {
+        for (auto w: m_windows) {
+            if (w->isFullscreen() && !m_fullscreenState) {
+                m_fullscreenState = true;
+                emit windowFullscreenChanged(true);
+                return;
+            }
+        }
+        if (m_fullscreenState) {
+            m_fullscreenState = false;
+            emit windowFullscreenChanged(false);
+        }
+    });
+
     window->setForeignToplevelHandle(handle);
 
     if (window->isReady())
diff --git a/panels/dock/taskmanager/treelandwindowmonitor.h b/panels/dock/taskmanager/treelandwindowmonitor.h
index 69370927c..5fce4e11c 100644
--- a/panels/dock/taskmanager/treelandwindowmonitor.h
+++ b/panels/dock/taskmanager/treelandwindowmonitor.h
@@ -84,5 +84,6 @@ private Q_SLOTS:
     QScopedPointer<ForeignToplevelManager> m_foreignToplevelManager;
     QScopedPointer<TreeLandDockPreviewContext> m_dockPreview;
 
+    bool m_fullscreenState;
 };
 }
diff --git a/panels/dock/waylanddockhelper.cpp b/panels/dock/waylanddockhelper.cpp
index 21a11b521..e7108ab33 100644
--- a/panels/dock/waylanddockhelper.cpp
+++ b/panels/dock/waylanddockhelper.cpp
@@ -3,6 +3,7 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "waylanddockhelper.h"
+#include "appletbridge.h"
 #include "constants.h"
 #include "dockhelper.h"
 #include "dockpanel.h"
@@ -19,10 +20,14 @@ WaylandDockHelper::WaylandDockHelper(DockPanel *panel)
     : DockHelper(panel)
     , m_panel(panel)
     , m_isWindowOverlap(false)
-    , m_isCurrentActiveWindowMaximized(false)
+    , m_isCurrentActiveWindowFullscreened(false)
 {
     m_wallpaperColorManager.reset(new WallpaperColorManager(this));
     m_ddeShellManager.reset(new TreeLandDDEShellManager());
+    DS_NAMESPACE::DAppletBridge bridge("org.deepin.ds.dock.taskmanager");
+    if (auto applet = bridge.applet()) {
+        connect(applet, SIGNAL(windowFullscreenChanged(bool)), this, SLOT(setCurrentActiveWindowFullscreened(bool)));
+    }
 
     connect(m_panel, &DockPanel::rootObjectChanged, this, [this]() {
         m_wallpaperColorManager->watchScreen(dockScreenName());
@@ -59,8 +64,6 @@ WaylandDockHelper::WaylandDockHelper(DockPanel *panel)
     if (m_panel->rootObject() != nullptr) {
         m_wallpaperColorManager->watchScreen(dockScreenName());
     }
-
-    // TODO: get taskmanager applet and use it to update m_isCurrentActiveWindowMaximized.
 }
 
 void WaylandDockHelper::updateOverlapCheckerPos()
@@ -116,9 +119,15 @@ QString WaylandDockHelper::dockScreenName()
     return {};
 }
 
-bool WaylandDockHelper::currentActiveWindowMaximized()
+bool WaylandDockHelper::currentActiveWindowFullscreened()
+{
+    return m_isCurrentActiveWindowFullscreened;
+}
+
+void WaylandDockHelper::setCurrentActiveWindowFullscreened(bool isFullscreen)
 {
-    return m_isCurrentActiveWindowMaximized;
+    m_isCurrentActiveWindowFullscreened = isFullscreen;
+    emit currentActiveWindowFullscreenChanged(isFullscreen);
 }
 
 bool WaylandDockHelper::isWindowOverlap()
diff --git a/panels/dock/waylanddockhelper.h b/panels/dock/waylanddockhelper.h
index 7eb1690b8..163e85fac 100644
--- a/panels/dock/waylanddockhelper.h
+++ b/panels/dock/waylanddockhelper.h
@@ -32,18 +32,21 @@ class WaylandDockHelper : public DockHelper
     QString dockScreenName();
 
 protected:
-    bool currentActiveWindowMaximized() override;
+    bool currentActiveWindowFullscreened() override;
     bool isWindowOverlap() override;
     [[nodiscard]] virtual DockWakeUpArea *createArea(QScreen *screen) override;
     void destroyArea(DockWakeUpArea *area) override;
 
+protected Q_SLOTS:
+    void setCurrentActiveWindowFullscreened(bool);
+
 private:
     void updateOverlapCheckerPos();
 
 private:
     friend class TreeLandWindowOverlapChecker;
     bool m_isWindowOverlap;
-    bool m_isCurrentActiveWindowMaximized;
+    bool m_isCurrentActiveWindowFullscreened;
     DockPanel *m_panel;
     QScopedPointer<WallpaperColorManager> m_wallpaperColorManager;
     QScopedPointer<TreeLandWindowOverlapChecker> m_overlapChecker;
diff --git a/panels/dock/x11dockhelper.cpp b/panels/dock/x11dockhelper.cpp
index 643647190..e795986c4 100644
--- a/panels/dock/x11dockhelper.cpp
+++ b/panels/dock/x11dockhelper.cpp
@@ -493,7 +493,7 @@ void X11DockHelper::updateDockArea()
     }
 }
 
-bool X11DockHelper::currentActiveWindowMaximized()
+bool X11DockHelper::currentActiveWindowFullscreened()
 {
     return false;
 }
diff --git a/panels/dock/x11dockhelper.h b/panels/dock/x11dockhelper.h
index 633ba8958..53804d2e4 100644
--- a/panels/dock/x11dockhelper.h
+++ b/panels/dock/x11dockhelper.h
@@ -61,7 +61,7 @@ class X11DockHelper : public DockHelper
     X11DockHelper(DockPanel *panel);
 
 protected:
-    bool currentActiveWindowMaximized() override;
+    bool currentActiveWindowFullscreened() override;
     bool isWindowOverlap() override;
 
     [[nodiscard]] DockWakeUpArea *createArea(QScreen *screen) override;