diff --git a/src/gui/kernel/qguiapplication.cpp b/src/gui/kernel/qguiapplication.cpp
index 8282bd34..29e2e61a 100644
--- a/src/gui/kernel/qguiapplication.cpp
+++ b/src/gui/kernel/qguiapplication.cpp
@@ -3058,6 +3058,7 @@ void QGuiApplicationPrivate::processTouchEvent(QWindowSystemInterfacePrivate::To
                 Qt::MouseButton button = Qt::NoButton;
                 Qt::MouseButtons buttons = Qt::LeftButton;
                 if (eventType == QEvent::TouchBegin && m_fakeMouseSourcePointId < 0)
+                    || (touchPoints.count() == 1 && m_fakeMouseSourcePointId != touchPoints.first().id()))
                     m_fakeMouseSourcePointId = touchPoints.first().id();
                 for (const auto &touchPoint : touchPoints) {
                     if (touchPoint.id() == m_fakeMouseSourcePointId) {
diff --git a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
index 27a2526d..fb2a335c 100644
--- a/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection_xi2.cpp
@@ -286,9 +286,11 @@ void QXcbConnection::xi2SetupDevices()
     m_tabletData.clear();
 #endif
     m_scrollingDevices.clear();
-    m_touchDevices.clear();
     m_xiMasterPointerIds.clear();
 
+    // FIXBUG: #123235 触摸过程中，插拔usb键盘/鼠标导致触摸失效
+    QList<quint16> deviceIds;
+
     auto reply = Q_XCB_REPLY(xcb_input_xi_query_device, xcb_connection(), XCB_INPUT_DEVICE_ALL);
     if (!reply) {
         qCDebug(lcQpaXInputDevices) << "failed to query devices";
@@ -303,8 +305,21 @@ void QXcbConnection::xi2SetupDevices()
             continue;
         }
         // only slave pointer devices are relevant here
-        if (deviceInfo->type == XCB_INPUT_DEVICE_TYPE_SLAVE_POINTER)
-            xi2SetupDevice(deviceInfo, false);
+
+        // FIXBUG: #123235 触摸过程中，插拔usb键盘/鼠标导致触摸失效
+        if (deviceInfo->type == XCB_INPUT_DEVICE_TYPE_SLAVE_POINTER) {
+            if (!m_touchDevices.contains(deviceInfo->deviceid)) {
+                xi2SetupDevice(deviceInfo, false);
+            } 
+            deviceIds.append(deviceInfo->deviceid);
+        }
+    }
+
+    // FIXBUG: #123235 触摸过程中，插拔usb键盘/鼠标导致触摸失效的问题
+    for (const auto &touchDeviceId : m_touchDevices.keys()) {
+        if (!deviceIds.contains(touchDeviceId)) {
+            m_touchDevices.remove(touchDeviceId);
+        }
     }
 
     if (m_xiMasterPointerIds.size() > 1)
@@ -593,6 +608,10 @@ void QXcbConnection::xi2HandleEvent(xcb_ge_event_t *event)
                         fixed1616ToReal(xiDeviceEvent->root_x), fixed1616ToReal(xiDeviceEvent->root_y),xiDeviceEvent->event);
             if (QXcbWindow *platformWindow = platformWindowFromId(xiDeviceEvent->event))
                 xi2ProcessTouch(xiDeviceEvent, platformWindow);
+            else { // When the window cannot be matched, delete it from touchPoints
+                if (TouchDeviceData *dev = touchDeviceForId(xiDeviceEvent->sourceid))
+                    dev->touchPoints.remove((xiDeviceEvent->detail % INT_MAX));
+            }
             break;
         }
     } else if (xiEnterEvent && !xi2MouseEventsDisabled() && eventListener) {