diff --git a/MainPanel.cpp b/MainPanel.cpp
index f5283d1..97ea91f 100644
--- a/MainPanel.cpp
+++ b/MainPanel.cpp
@@ -29,16 +29,17 @@ void CMainPanel::InitPanel()
     sizer_select_->Add(btn_select_, 0, wxALL | wxALIGN_LEFT, g_Border);
 
     // 将水平 sizer 添加到带标题的 sizer 中, wxALIGN_CENTER_VERTICAL 仅水平可用
-    base_box_sizer_->Add(label_select_, 0, wxALL, g_Border);
+    base_box_sizer_->Add(label_select_, 0, wxALL | wxEXPAND, g_Border);
     base_box_sizer_->Add(sizer_select_, 0, wxALL | wxEXPAND, g_Border);
 
     sizer_output_ = new wxBoxSizer(wxHORIZONTAL);
     btn_output_ = new wxButton(this, wxID_ANY, wxT("选择目录"));
+    btn_output_->Bind(wxEVT_BUTTON, &CMainPanel::selectDir, this);
     text_output_ctrl_ = new wxTextCtrl(this, wxID_ANY);
     label_output_ = new wxStaticText(this, wxID_ANY, wxT("输出目录："));
-    base_box_sizer_->Add(label_output_, 0, wxALL, g_Border);
+    base_box_sizer_->Add(label_output_, 0, wxALL| wxEXPAND, g_Border);
 
-    sizer_output_->Add(text_output_ctrl_, 1, wxALL, g_Border);
+    sizer_output_->Add(text_output_ctrl_, 1, wxALL | wxEXPAND, g_Border);
     sizer_output_->Add(btn_output_, 0, wxALL, g_Border);
     base_box_sizer_->Add(sizer_output_, 0, wxALL | wxEXPAND, g_Border);
 
@@ -75,6 +76,16 @@ void CMainPanel::InitPanel()
     SetSizer(top_sizer_);
 }
 
+void CMainPanel::selectDir(wxCommandEvent& event)
+{
+    wxDirDialog dirDialog(this, wxT("Select Directory"), wxEmptyString, wxDD_DIR_MUST_EXIST);
+
+    if (dirDialog.ShowModal() == wxID_CANCEL) return;   // 用户取消选择
+
+    wxString selectedDir = dirDialog.GetPath();
+    text_output_ctrl_->SetValue(selectedDir);
+}
+
 void CMainPanel::genResult(wxCommandEvent& event)
 {
     wxArrayString arrayStrings;
diff --git a/MainPanel.h b/MainPanel.h
index 55faaf8..516937b 100644
--- a/MainPanel.h
+++ b/MainPanel.h
@@ -44,6 +44,7 @@ public:
 
 private:
     void selectBinaryFile(wxCommandEvent& event);
+    void selectDir(wxCommandEvent& event);
     void addEnv(wxCommandEvent& event);
     void delEnv(wxCommandEvent& event);
     void genResult(wxCommandEvent& event);