diff --git a/mainwindow.cpp b/mainwindow.cpp
index 8c3e2cb..93d574b 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -62,4 +62,4 @@ bool MainWindow::eventFilter(QObject *obj, QEvent *event) {
            list->setGeometry(x()+width() + 15, y() + width() / 2, 400, 450);
        }
        return QWidget::eventFilter(obj, event);
-   }
+}
diff --git a/monitor.cpp b/monitor.cpp
index ba1a5f3..9d2ed4f 100644
--- a/monitor.cpp
+++ b/monitor.cpp
@@ -45,6 +45,18 @@ Monitor::Monitor(MainWindow *parent) :
     CarList::getInstance()->setAdapter(adapter);
 }
 
+void Monitor::showEvent(QShowEvent *event)
+{
+    QWidget::showEvent(event);
+    QTimer *timer = new QTimer(this);
+    timer->setSingleShot(true);
+    connect(timer, &QTimer::timeout, [this]() {
+        emit this->ui->showList->toggle();
+        emit this->ui->showLog->toggle();
+    });
+    timer->start(100);  // 延时100ms，等待窗口创建完毕后执行，哈哈哈哈哈
+}
+
 Monitor::~Monitor()
 {
     delete ui;
diff --git a/monitor.h b/monitor.h
index 05e00f8..c014546 100644
--- a/monitor.h
+++ b/monitor.h
@@ -20,6 +20,7 @@ class Monitor : public QWidget
 
 public:
     explicit Monitor(MainWindow *parent = 0);
+    void showEvent(QShowEvent *event);
     ~Monitor();
 
 private:
diff --git a/monitor.ui b/monitor.ui
index 3a86d8d..27102f8 100644
--- a/monitor.ui
+++ b/monitor.ui
@@ -202,6 +202,9 @@
           <property name="text">
            <string/>
           </property>
+          <property name="maxLength">
+           <number>6</number>
+          </property>
           <property name="placeholderText">
            <string>车牌号</string>
           </property>