diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0dd85ca..0f0881b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,7 +6,7 @@ set(CMAKE_AUTOMOC ON)
 set(CMAKE_AUTORCC ON)
 set(CMAKE_AUTOUIC ON)
 
-set(CMAKE_PREFIX_PATH "/home/misaki/Qt6.3/6.6.3/gcc_64")    # 设置Qt6安装路径(此处请根据你的Qt6安装位置填写)
+set(CMAKE_PREFIX_PATH "/home/misaki/Qt/6.6.3/gcc_64")    # 设置Qt6安装路径(此处请根据你的Qt6安装位置填写)
 
 # 设置是否为debug模式 默认为Debug
 if(NOT CMAKE_BUILD_TYPE)
@@ -183,6 +183,16 @@ target_link_libraries(${PROJECT_NAME}
         Qt::Concurrent
 )
 
+# 全局热键 (PTT) 所需平台库
+if(APPLE)
+    find_library(COREGRAPHICS_LIB CoreGraphics REQUIRED)
+    target_link_libraries(${PROJECT_NAME} PRIVATE ${COREGRAPHICS_LIB})
+endif()
+if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+    find_package(X11 REQUIRED)
+    target_link_libraries(${PROJECT_NAME} PRIVATE X11::X11)
+endif()
+
 # 添加头文件
 target_include_directories(${PROJECT_NAME}
     PRIVATE
diff --git a/src/Core/Inc/AppCore.h b/src/Core/Inc/AppCore.h
index 106d238..17e8c23 100644
--- a/src/Core/Inc/AppCore.h
+++ b/src/Core/Inc/AppCore.h
@@ -12,12 +12,22 @@
 #include <QMutex>
 #include <QObject>
 #include <QHash>
+#ifdef Q_OS_WIN
+#include <windows.h>
+#endif
+#ifdef Q_OS_LINUX
+#include <QAbstractNativeEventFilter>
+#endif
 #include "serialportmanager.h"
 
 class DeviceTcpServer;
 class DeviceWebSocketServer;
 
-class AppCore final : public QObject {
+class AppCore final : public QObject
+#ifdef Q_OS_LINUX
+    , public QAbstractNativeEventFilter
+#endif
+{
     Q_OBJECT
     Q_DISABLE_COPY(AppCore)
 
@@ -44,5 +54,35 @@ public:
 
 public:
     void SingleExchange();
-    void tryToInit() { return; };
+    void tryToInit() { return; }
+
+    // PTT 按住说话
+    void startPttRecording();
+    void stopPttRecording();
+
+    void setupGlobalHotkey();
+    void cleanupGlobalHotkey();
+
+#if defined(Q_OS_WIN)
+private:
+    static LRESULT CALLBACK lowLevelKeyboardHook(int nCode, WPARAM wParam, LPARAM lParam);
+    HHOOK m_keyboardHook = nullptr;
+    bool m_isPttDown = false;
+    UINT m_hotkeyVKey = VK_OEM_3;
+
+#elif defined(Q_OS_LINUX)
+private:
+    bool nativeEventFilter(const QByteArray &eventType, void *message, qintptr *result) override;
+    void onDebounceStop();
+    bool m_isPttDown = false;
+    int m_hotkeyCode = 0;
+    class QTimer *m_pttDebounce = nullptr;
+
+#elif defined(Q_OS_MACOS)
+private:
+    void *m_eventTap = nullptr;
+    void *m_runLoopSource = nullptr;
+    bool m_isPttDown = false;
+    int m_hotkeyCode = 50;
+#endif
 };
\ No newline at end of file
diff --git a/src/Core/Src/AppCore.cpp b/src/Core/Src/AppCore.cpp
index 9a62528..d03be26 100644
--- a/src/Core/Src/AppCore.cpp
+++ b/src/Core/Src/AppCore.cpp
@@ -4,6 +4,8 @@
 
 #include "AppCore.h"
 #include <QDebug>
+#include <QApplication>
+#include <QTimer>
 
 #include "AudioDataHandle.h"
 #include "AutoAgentHandle.h"
@@ -15,10 +17,26 @@
 #include "websocketmanager.h"
 #include "DeviceTcpServer.h"
 #include "DeviceWebSocketServer.h"
+
+#ifdef Q_OS_LINUX
+#include <X11/Xlib.h>
+#include <X11/keysym.h>
+#include <X11/XKBlib.h>
+#endif
+
+#ifdef Q_OS_MACOS
+#include <CoreGraphics/CoreGraphics.h>
+#include <CoreFoundation/CoreFoundation.h>
+#endif
+
 // 初始化静态成员
 QScopedPointer<AppCore> AppCore::m_instance;
 QMutex AppCore::m_mutex;
 
+#ifdef Q_OS_WIN
+static AppCore *g_hotkeyInstance = nullptr;
+#endif
+
 // 单例实现 (QScopedPointer + Mutex)
 AppCore* AppCore::getInstance()
 {
@@ -81,10 +99,13 @@ AppCore::AppCore(QObject *parent) : QObject(parent)
     // 连接必要的信号
     connect(AudioInput::getInstance(), &AudioInput::recordingFinished_Byte,
         this, &AppCore::onRecordingFinished_Byte);
+
+    setupGlobalHotkey();
 }
 
 AppCore::~AppCore()
 {
+    cleanupGlobalHotkey();
     if (m_deviceTcpServer) m_deviceTcpServer->stop();
     if (m_deviceWsServer) m_deviceWsServer->stop();
 
@@ -118,3 +139,209 @@ void AppCore::onRecordingFinished_Byte(const QByteArray &wavData) {
     NetworkDO::getInstance()->sendPacket(packet);
 }
 
+void AppCore::startPttRecording() {
+    qDebug() << "PTT recording started";
+    AudioInput::getInstance()->startAudio();
+}
+
+void AppCore::stopPttRecording() {
+    qDebug() << "PTT recording stopped";
+    AudioInput::getInstance()->stopAudio();
+}
+
+// ===================== Windows =====================
+#ifdef Q_OS_WIN
+void AppCore::setupGlobalHotkey() {
+    g_hotkeyInstance = this;
+    HMODULE hMod = GetModuleHandle(nullptr);
+    m_keyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, lowLevelKeyboardHook, hMod, 0);
+    if (m_keyboardHook) {
+        qDebug() << "[AppCore] 全局 PTT 热键钩子已安装 (键码:" << m_hotkeyVKey << ")";
+    } else {
+        qWarning() << "[AppCore] 全局 PTT 热键钩子安装失败:" << GetLastError();
+    }
+}
+
+void AppCore::cleanupGlobalHotkey() {
+    if (m_keyboardHook) {
+        UnhookWindowsHookEx(m_keyboardHook);
+        m_keyboardHook = nullptr;
+        qDebug() << "[AppCore] 全局 PTT 热键钩子已卸载";
+    }
+    g_hotkeyInstance = nullptr;
+}
+
+LRESULT CALLBACK AppCore::lowLevelKeyboardHook(int nCode, WPARAM wParam, LPARAM lParam) {
+    if (nCode == HC_ACTION && g_hotkeyInstance) {
+        KBDLLHOOKSTRUCT *pKb = reinterpret_cast<KBDLLHOOKSTRUCT*>(lParam);
+        if (pKb->vkCode == g_hotkeyInstance->m_hotkeyVKey) {
+            if (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN) {
+                if (!g_hotkeyInstance->m_isPttDown) {
+                    g_hotkeyInstance->m_isPttDown = true;
+                    QMetaObject::invokeMethod(qApp, []() {
+                        AppCore::getInstance()->startPttRecording();
+                    }, Qt::QueuedConnection);
+                }
+                return 1;
+            } else if (wParam == WM_KEYUP || wParam == WM_SYSKEYUP) {
+                if (g_hotkeyInstance->m_isPttDown) {
+                    g_hotkeyInstance->m_isPttDown = false;
+                    QMetaObject::invokeMethod(qApp, []() {
+                        AppCore::getInstance()->stopPttRecording();
+                    }, Qt::QueuedConnection);
+                }
+                return 1;
+            }
+        }
+    }
+    return CallNextHookEx(nullptr, nCode, wParam, lParam);
+}
+
+// ===================== Linux (X11) =====================
+#elif defined(Q_OS_LINUX)
+void AppCore::setupGlobalHotkey() {
+    Display *display = XOpenDisplay(nullptr);
+    if (!display) {
+        qWarning() << "[AppCore] 无法打开 X11 Display，全局热键不可用";
+        return;
+    }
+
+    // 尝试开启 detectable auto-repeat（不一定持久影响其他连接，不影响 debounce 方案）
+    int orig = 0;
+    XkbSetDetectableAutoRepeat(display, True, &orig);
+
+    KeyCode keycode = XKeysymToKeycode(display, XK_grave);
+    if (!keycode) {
+        qWarning() << "[AppCore] 未找到波浪号键的键码";
+        XCloseDisplay(display);
+        return;
+    }
+    m_hotkeyCode = keycode;
+
+    XGrabKey(display, keycode, AnyModifier, DefaultRootWindow(display),
+             True, GrabModeAsync, GrabModeAsync);
+    XCloseDisplay(display);
+
+    // debounce 定时器：KeyRelease 后等待 50ms，若没有新的 KeyPress 再停
+    m_pttDebounce = new QTimer(this);
+    m_pttDebounce->setSingleShot(true);
+    connect(m_pttDebounce, &QTimer::timeout, this, &AppCore::onDebounceStop);
+
+    qApp->installNativeEventFilter(this);
+    qDebug() << "[AppCore] Linux 全局 PTT 热键已注册 (键码:" << m_hotkeyCode << ")";
+}
+
+void AppCore::cleanupGlobalHotkey() {
+    qApp->removeNativeEventFilter(this);
+    if (m_pttDebounce) {
+        m_pttDebounce->stop();
+        delete m_pttDebounce;
+        m_pttDebounce = nullptr;
+    }
+    Display *display = XOpenDisplay(nullptr);
+    if (display) {
+        XUngrabKey(display, m_hotkeyCode, AnyModifier, DefaultRootWindow(display));
+        XCloseDisplay(display);
+    }
+    m_hotkeyCode = 0;
+    qDebug() << "[AppCore] Linux 全局 PTT 热键已卸载";
+}
+
+void AppCore::onDebounceStop() {
+    if (m_isPttDown) {
+        m_isPttDown = false;
+        stopPttRecording();
+    }
+}
+
+bool AppCore::nativeEventFilter(const QByteArray &eventType, void *message, qintptr *result) {
+    if (eventType != "xcb_generic_event_t")
+        return false;
+
+    auto *data = static_cast<const uint8_t *>(message);
+    uint8_t type = data[0] & 0x7f;
+
+    if ((type == 2 || type == 3) && data[1] == static_cast<uint8_t>(m_hotkeyCode)) {
+        if (type == 2) {                              // KeyPress
+            m_pttDebounce->stop();                    // 取消待决的停止
+            if (!m_isPttDown) {
+                m_isPttDown = true;
+                startPttRecording();
+            }
+        } else {                                        // KeyRelease
+            // 不立即停，等待 50ms 确认没有连发 KeyPress
+            if (m_isPttDown)
+                m_pttDebounce->start(50);
+        }
+        if (result) *result = 1;
+        return true;
+    }
+    return false;
+}
+
+// ===================== macOS (CGEventTap) =====================
+#elif defined(Q_OS_MACOS)
+static CGEventRef pttEventTapCallback(CGEventTapProxy proxy, CGEventType type, CGEventRef event, void *refcon) {
+    auto *core = static_cast<AppCore *>(refcon);
+
+    if (type == kCGEventTapDisabledByTimeout) {
+        if (core && core->m_eventTap)
+            CGEventTapEnable(static_cast<CFMachPortRef>(core->m_eventTap), true);
+        return event;
+    }
+    if (type != kCGEventKeyDown && type != kCGEventKeyUp)
+        return event;
+
+    CGKeyCode kc = static_cast<CGKeyCode>(CGEventGetIntegerValueField(event, kCGKeyboardEventKeycode));
+    if (kc != core->m_hotkeyCode)
+        return event;
+
+    if (type == kCGEventKeyDown && !core->m_isPttDown) {
+        core->m_isPttDown = true;
+        core->startPttRecording();
+    } else if (type == kCGEventKeyUp && core->m_isPttDown) {
+        core->m_isPttDown = false;
+        core->stopPttRecording();
+    }
+    return nullptr;
+}
+
+void AppCore::setupGlobalHotkey() {
+    CFMachPortRef tap = CGEventTapCreate(
+        kCGHIDEventTap,
+        kCGHeadInsertEventTap,
+        kCGEventTapOptionDefault,
+        CGEventMaskBit(kCGEventKeyDown) | CGEventMaskBit(kCGEventKeyUp),
+        &pttEventTapCallback,
+        this);
+
+    if (!tap) {
+        qWarning() << "[AppCore] macOS PTT 热键创建失败 (需要辅助功能权限)";
+        return;
+    }
+
+    m_eventTap = tap;
+    CFRunLoopSourceRef src = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, tap, 0);
+    m_runLoopSource = src;
+    CFRunLoopAddSource(CFRunLoopGetCurrent(), src, kCFRunLoopCommonModes);
+    CGEventTapEnable(tap, true);
+    qDebug() << "[AppCore] macOS 全局 PTT 热键已注册 (键码:" << m_hotkeyCode << ")";
+}
+
+void AppCore::cleanupGlobalHotkey() {
+    if (m_eventTap) {
+        auto *tap = static_cast<CFMachPortRef>(m_eventTap);
+        CGEventTapEnable(tap, false);
+        if (m_runLoopSource) {
+            auto *src = static_cast<CFRunLoopSourceRef>(m_runLoopSource);
+            CFRunLoopRemoveSource(CFRunLoopGetCurrent(), src, kCFRunLoopCommonModes);
+            CFRelease(src);
+        }
+        CFRelease(tap);
+        m_eventTap = nullptr;
+        m_runLoopSource = nullptr;
+    }
+    qDebug() << "[AppCore] macOS 全局 PTT 热键已卸载";
+}
+#endif
+