diff --git a/client/gui/main_window/MainWindow.cpp b/client/gui/main_window/MainWindow.cpp
index 6f678a9..d2dc2e4 100644
--- a/client/gui/main_window/MainWindow.cpp
+++ b/client/gui/main_window/MainWindow.cpp
@@ -68,6 +68,13 @@ namespace {
 constexpr int kRightDockMinimumWidth = 80;
 /// 列宽小于此值时自动隐藏右侧两 dock
 constexpr int kRightDockAutoHideBelow = 92;
+/// 右侧 dock 列最大宽度，避免过宽挤占画布
+constexpr int kRightDockMaximumWidth = 288;
+/// 属性区表单内容最大宽度（dock 仍可略宽，两侧留白，避免 SpinBox 被拉得过开）
+constexpr int kPropertyPanelContentMaxWidth = 268;
+/// 启动时垂直分割高度：项目树较矮、属性区较高
+constexpr int kProjectTreeDockStartupHeight = 148;
+constexpr int kPropertiesDockStartupHeight = 392;
 
 void polishCompactToolButton(QToolButton* b, int px = 40) {
     if (!b) return;
@@ -947,12 +954,13 @@ void MainWindow::createProjectTreeDock() {
                                       Qt::BottomDockWidgetArea | Qt::TopDockWidgetArea);
     m_dockProperties->setFeatures(QDockWidget::DockWidgetMovable | QDockWidget::DockWidgetFloatable |
                                   QDockWidget::DockWidgetClosable);
-    m_dockProperties->setMinimumWidth(kRightDockMinimumWidth);
+    m_dockProperties->setMinimumWidth(236);
 
     m_bgPropertySection = new gui::BackgroundPropertySection();
     m_entityPropertySection = new gui::EntityPropertySection();
     m_propertyStack = new QStackedWidget();
     m_propertyStack->setContentsMargins(4, 4, 4, 4);
+    m_propertyStack->setMaximumWidth(kPropertyPanelContentMaxWidth);
     m_propertyStack->addWidget(m_bgPropertySection);
     m_propertyStack->addWidget(m_entityPropertySection);
 
@@ -1048,7 +1056,9 @@ void MainWindow::createProjectTreeDock() {
 
     addDockWidget(Qt::RightDockWidgetArea, m_dockProjectTree);
     splitDockWidget(m_dockProjectTree, m_dockProperties, Qt::Vertical);
-    resizeDocks({m_dockProjectTree, m_dockProperties}, {220, 200}, Qt::Vertical);
+    resizeDocks({m_dockProjectTree, m_dockProperties},
+                {kProjectTreeDockStartupHeight, kPropertiesDockStartupHeight},
+                Qt::Vertical);
 
     connect(m_dockProjectTree, &QDockWidget::visibilityChanged, this, [this](bool visible) {
         if (m_actionToggleProjectTree) {
@@ -1064,6 +1074,26 @@ void MainWindow::createProjectTreeDock() {
             m_actionToggleProperties->blockSignals(false);
         }
     });
+
+    // 停靠时限制右侧列最大宽度；浮动时解除，避免属性/项目树窗口过窄难用
+    const auto applyRightDockColumnMaxWidth = [](QDockWidget* dock) {
+        if (!dock) {
+            return;
+        }
+        dock->setMaximumWidth(dock->isFloating() ? QWIDGETSIZE_MAX : kRightDockMaximumWidth);
+    };
+    applyRightDockColumnMaxWidth(m_dockProjectTree);
+    applyRightDockColumnMaxWidth(m_dockProperties);
+    connect(m_dockProjectTree, &QDockWidget::topLevelChanged, this,
+            [applyRightDockColumnMaxWidth, this](bool) {
+                applyRightDockColumnMaxWidth(m_dockProjectTree);
+                applyRightDockColumnMaxWidth(m_dockProperties);
+            });
+    connect(m_dockProperties, &QDockWidget::topLevelChanged, this,
+            [applyRightDockColumnMaxWidth, this](bool) {
+                applyRightDockColumnMaxWidth(m_dockProjectTree);
+                applyRightDockColumnMaxWidth(m_dockProperties);
+            });
 }
 
 void MainWindow::refreshPropertyPanel() {