diff --git a/applets/CMakeLists.txt b/applets/CMakeLists.txt
index c93043d84..0486c8430 100644
--- a/applets/CMakeLists.txt
+++ b/applets/CMakeLists.txt
@@ -5,4 +5,5 @@
 add_subdirectory(dde-am)
 add_subdirectory(dde-appearance)
 add_subdirectory(dde-apps)
+add_subdirectory(dde-key-notify)
 add_subdirectory(dde-shutdown)
diff --git a/applets/dde-key-notify/CMakeLists.txt b/applets/dde-key-notify/CMakeLists.txt
new file mode 100644
index 000000000..bf02afea6
--- /dev/null
+++ b/applets/dde-key-notify/CMakeLists.txt
@@ -0,0 +1,30 @@
+# SPDX-FileCopyrightText: 2026 UnionTech Software Technology Co., Ltd.
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+find_package(TreelandProtocols REQUIRED)
+
+set(TREELAND_KEYBOARD_STATE_NOTIFY_PROTOCOL
+    ${TREELAND_PROTOCOLS_DATA_DIR}/treeland-keyboard-state-notify-unstable-v1.xml
+)
+
+add_library(dde-key-notify SHARED
+    keynotifyapplet.cpp
+    keynotifyapplet.h
+    treelandkeynotify.cpp
+    treelandkeynotify.h
+)
+
+qt_generate_wayland_protocol_client_sources(dde-key-notify
+    NO_INCLUDE_CORE_ONLY
+    FILES
+        ${TREELAND_KEYBOARD_STATE_NOTIFY_PROTOCOL}
+)
+
+target_link_libraries(dde-key-notify PRIVATE
+    dde-shell-frame
+    Qt${QT_VERSION_MAJOR}::DBus
+    Qt${QT_VERSION_MAJOR}::WaylandClient
+)
+
+ds_install_package(PACKAGE org.deepin.ds.dde-key-notify TARGET dde-key-notify)
diff --git a/applets/dde-key-notify/keynotifyapplet.cpp b/applets/dde-key-notify/keynotifyapplet.cpp
new file mode 100644
index 000000000..e069e4415
--- /dev/null
+++ b/applets/dde-key-notify/keynotifyapplet.cpp
@@ -0,0 +1,75 @@
+// SPDX-FileCopyrightText: 2026 UnionTech Software Technology Co., Ltd.
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "keynotifyapplet.h"
+
+#include "pluginfactory.h"
+#include "treelandkeynotify.h"
+
+#include <DDBusSender>
+#include <DGuiApplicationHelper>
+
+DCORE_USE_NAMESPACE
+
+DS_BEGIN_NAMESPACE
+namespace keynotify
+{
+
+KeyNotifyApplet::KeyNotifyApplet(QObject *parent)
+    : DApplet(parent)
+{
+}
+
+KeyNotifyApplet::~KeyNotifyApplet() = default;
+
+bool KeyNotifyApplet::load()
+{
+    if (!Dtk::Gui::DGuiApplicationHelper::testAttribute(Dtk::Gui::DGuiApplicationHelper::IsWaylandPlatform)) {
+        return DApplet::load();
+    }
+
+    m_keyNotify = new TreelandKeyNotify(this);
+    connect(m_keyNotify, &TreelandKeyNotify::capsLockChanged, this, &KeyNotifyApplet::showCapsLockOsd);
+    connect(m_keyNotify, &TreelandKeyNotify::numLockChanged, this, &KeyNotifyApplet::showNumLockOsd);
+    initConfig();
+    m_keyNotify->setCapsLockEnabled(m_config->value(QStringLiteral("capslockToggle")).toBool());
+    return DApplet::load();
+}
+
+void KeyNotifyApplet::showCapsLockOsd(bool locked)
+{
+    sendOsd(locked ? QStringLiteral("CapsLockOn") : QStringLiteral("CapsLockOff"));
+}
+
+void KeyNotifyApplet::showNumLockOsd(bool locked)
+{
+    sendOsd(locked ? QStringLiteral("NumLockOn") : QStringLiteral("NumLockOff"));
+}
+
+void KeyNotifyApplet::updateCapsLockToggle(const QString &key)
+{
+    if (key != QStringLiteral("capslockToggle")) {
+        return;
+    }
+
+    m_keyNotify->setCapsLockEnabled(m_config->value(key).toBool());
+}
+
+void KeyNotifyApplet::sendOsd(const QString &osdType)
+{
+    DDBusSender().service("org.deepin.dde.shell").path("/org/deepin/dde/shell/osd").interface("org.deepin.dde.shell.osd").method("ShowOSD").arg(osdType).call();
+}
+
+void KeyNotifyApplet::initConfig()
+{
+    m_config = Dtk::Core::DConfig::create(QStringLiteral("org.deepin.dde.daemon"), QStringLiteral("org.deepin.dde.daemon.keyboard"), QString(), this);
+    connect(m_config, &Dtk::Core::DConfig::valueChanged, this, &KeyNotifyApplet::updateCapsLockToggle);
+}
+
+D_APPLET_CLASS(KeyNotifyApplet)
+
+}
+DS_END_NAMESPACE
+
+#include "keynotifyapplet.moc"
diff --git a/applets/dde-key-notify/keynotifyapplet.h b/applets/dde-key-notify/keynotifyapplet.h
new file mode 100644
index 000000000..1f664e622
--- /dev/null
+++ b/applets/dde-key-notify/keynotifyapplet.h
@@ -0,0 +1,44 @@
+// SPDX-FileCopyrightText: 2026 UnionTech Software Technology Co., Ltd.
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "applet.h"
+
+#include <DConfig>
+
+#include <QPointer>
+
+DS_BEGIN_NAMESPACE
+namespace keynotify
+{
+
+class TreelandKeyNotify;
+
+class KeyNotifyApplet : public DApplet
+{
+    Q_OBJECT
+
+public:
+    explicit KeyNotifyApplet(QObject *parent = nullptr);
+    ~KeyNotifyApplet() override;
+
+    bool load() override;
+
+private Q_SLOTS:
+    void showCapsLockOsd(bool locked);
+    void showNumLockOsd(bool locked);
+    void updateCapsLockToggle(const QString &key);
+
+private:
+    void sendOsd(const QString &osdType);
+    void initConfig();
+
+private:
+    QPointer<TreelandKeyNotify> m_keyNotify;
+    Dtk::Core::DConfig *m_config = nullptr;
+};
+
+}
+DS_END_NAMESPACE
diff --git a/applets/dde-key-notify/package/metadata.json b/applets/dde-key-notify/package/metadata.json
new file mode 100644
index 000000000..5fd63c575
--- /dev/null
+++ b/applets/dde-key-notify/package/metadata.json
@@ -0,0 +1,7 @@
+{
+    "Plugin": {
+        "Version": "1.0",
+        "Id": "org.deepin.ds.dde-key-notify",
+        "Category": "DDE"
+    }
+}
diff --git a/applets/dde-key-notify/treelandkeynotify.cpp b/applets/dde-key-notify/treelandkeynotify.cpp
new file mode 100644
index 000000000..1fda99bb8
--- /dev/null
+++ b/applets/dde-key-notify/treelandkeynotify.cpp
@@ -0,0 +1,99 @@
+// SPDX-FileCopyrightText: 2026 UnionTech Software Technology Co., Ltd.
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "treelandkeynotify.h"
+
+#include "wayland-treeland-keyboard-state-notify-unstable-v1-client-protocol.h"
+
+DS_BEGIN_NAMESPACE
+namespace keynotify
+{
+
+TreelandKeyNotify::TreelandKeyNotify(QObject *parent)
+    : QWaylandClientExtensionTemplate<TreelandKeyNotify>(treeland_keyboard_state_notify_manager_v1_interface.version)
+{
+    setParent(parent);
+    connect(this, &TreelandKeyNotify::activeChanged, this, &TreelandKeyNotify::updateWatcher);
+}
+
+void TreelandKeyNotify::setCapsLockEnabled(bool enabled)
+{
+    if (m_capsLockEnabled == enabled) {
+        return;
+    }
+
+    m_capsLockEnabled = enabled;
+    updateWatcher();
+}
+
+void TreelandKeyNotify::updateWatcher()
+{
+    if (!isActive()) {
+        if (m_watcher) {
+            m_watcher->deleteLater();
+            m_watcher = nullptr;
+        }
+        return;
+    }
+
+    if (!m_watcher) {
+        m_watcher = createWatcher(this);
+        if (!m_watcher) {
+            return;
+        }
+
+        connect(m_watcher, &TreelandKeyWatcher::stateChanged, this, [this](uint32_t modifier, uint32_t state) {
+            if (modifier == TreelandKeyWatcher::modifier_caps_lock) {
+                if (state == TreelandKeyWatcher::modifier_state_locked) {
+                    Q_EMIT capsLockChanged(true);
+                } else if (state == TreelandKeyWatcher::modifier_state_unlocked) {
+                    Q_EMIT capsLockChanged(false);
+                }
+            } else if (modifier == TreelandKeyWatcher::modifier_num_lock) {
+                if (state == TreelandKeyWatcher::modifier_state_locked) {
+                    Q_EMIT numLockChanged(true);
+                } else if (state == TreelandKeyWatcher::modifier_state_unlocked) {
+                    Q_EMIT numLockChanged(false);
+                }
+            }
+        });
+    }
+
+    m_watcher->watchLocks(m_capsLockEnabled);
+}
+
+TreelandKeyWatcher *TreelandKeyNotify::createWatcher(QObject *parent)
+{
+    if (!isActive()) {
+        return nullptr;
+    }
+
+    auto *watcher = get_keyboard_state_watcher(nullptr);
+    if (!watcher) {
+        return nullptr;
+    }
+
+    return new TreelandKeyWatcher(watcher, parent);
+}
+
+TreelandKeyWatcher::TreelandKeyWatcher(struct ::treeland_keyboard_state_watcher_v1 *object, QObject *parent)
+    : QObject(parent)
+    , QtWayland::treeland_keyboard_state_watcher_v1(object)
+{
+}
+
+void TreelandKeyWatcher::watchLocks(bool watchCapsLock)
+{
+    set_modifiers(watchCapsLock ? modifier_caps_lock | modifier_num_lock : modifier_num_lock);
+    set_flags(watch_flag_locked | watch_flag_unlocked);
+    apply();
+}
+
+void TreelandKeyWatcher::treeland_keyboard_state_watcher_v1_state_changed(uint32_t modifier, uint32_t state)
+{
+    Q_EMIT stateChanged(modifier, state);
+}
+
+}
+DS_END_NAMESPACE
diff --git a/applets/dde-key-notify/treelandkeynotify.h b/applets/dde-key-notify/treelandkeynotify.h
new file mode 100644
index 000000000..7ddd78fa7
--- /dev/null
+++ b/applets/dde-key-notify/treelandkeynotify.h
@@ -0,0 +1,62 @@
+// SPDX-FileCopyrightText: 2026 UnionTech Software Technology Co., Ltd.
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "dsglobal.h"
+#include "qwayland-treeland-keyboard-state-notify-unstable-v1.h"
+
+#include <QPointer>
+#include <QtWaylandClient/QWaylandClientExtension>
+
+struct treeland_keyboard_state_watcher_v1;
+
+DS_BEGIN_NAMESPACE
+namespace keynotify
+{
+
+class TreelandKeyWatcher;
+
+class TreelandKeyNotify : public QWaylandClientExtensionTemplate<TreelandKeyNotify>, public QtWayland::treeland_keyboard_state_notify_manager_v1
+{
+    Q_OBJECT
+
+public:
+    explicit TreelandKeyNotify(QObject *parent = nullptr);
+
+    void setCapsLockEnabled(bool enabled);
+
+Q_SIGNALS:
+    void capsLockChanged(bool locked);
+    void numLockChanged(bool locked);
+
+private Q_SLOTS:
+    void updateWatcher();
+
+private:
+    TreelandKeyWatcher *createWatcher(QObject *parent = nullptr);
+
+private:
+    bool m_capsLockEnabled = false;
+    QPointer<TreelandKeyWatcher> m_watcher;
+};
+
+class TreelandKeyWatcher : public QObject, public QtWayland::treeland_keyboard_state_watcher_v1
+{
+    Q_OBJECT
+
+public:
+    explicit TreelandKeyWatcher(struct ::treeland_keyboard_state_watcher_v1 *object, QObject *parent = nullptr);
+
+    void watchLocks(bool watchCapsLock);
+
+Q_SIGNALS:
+    void stateChanged(uint32_t modifier, uint32_t state);
+
+protected:
+    void treeland_keyboard_state_watcher_v1_state_changed(uint32_t modifier, uint32_t state) override;
+};
+
+}
+DS_END_NAMESPACE
diff --git a/debian/control b/debian/control
index b98ab6b1c..80383de34 100644
--- a/debian/control
+++ b/debian/control
@@ -40,7 +40,7 @@ Build-Depends:
  qt6-wayland-dev-tools,
  qt6-wayland-private-dev,
  systemd,
- treeland-protocols (>= 0.5.7),
+ treeland-protocols (>> 0.5.7),
  wayland-protocols,
 Standards-Version: 4.6.2
 Homepage: https://github.com/linuxdeepin/dde-shell
diff --git a/debian/dde-shell.install b/debian/dde-shell.install
index 228149a31..c85ddeb6b 100644
--- a/debian/dde-shell.install
+++ b/debian/dde-shell.install
@@ -2,6 +2,7 @@ usr/bin/*
 usr/lib/*/dde-shell/org.deepin.ds.dde-am*
 usr/lib/*/dde-shell/org.deepin.ds.dde-appearance*
 usr/lib/*/dde-shell/org.deepin.ds.dde-apps*
+usr/lib/*/dde-shell/org.deepin.ds.dde-key-notify*
 usr/lib/*/dde-shell/org.deepin.ds.dde-shutdown*
 usr/lib/*/dde-shell/org.deepin.ds.dock*
 usr/lib/*/dde-shell/org.deepin.ds.notification*
@@ -19,6 +20,7 @@ usr/share/dde-shell/*/translations
 usr/share/dde-shell/org.deepin.ds.dde-am*/
 usr/share/dde-shell/org.deepin.ds.dde-appearance*/
 usr/share/dde-shell/org.deepin.ds.dde-apps*/
+usr/share/dde-shell/org.deepin.ds.dde-key-notify*/
 usr/share/dde-shell/org.deepin.ds.dde-shutdown*/
 usr/share/dde-shell/org.deepin.ds.dock*/
 usr/share/dde-shell/org.deepin.ds.notification*/