diff --git a/src/app/main.cpp b/src/app/main.cpp
index 52ccc2d..4b872d2 100644
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@@ -543,7 +543,6 @@ void buildWorkbench(QMainWindow& window, geopro::data::LocalSampleRepository& re
     auto* btnSliceFrontBack = new QPushButton(QStringLiteral("前后"));
     auto* btnSliceLeftRight = new QPushButton(QStringLiteral("左右"));
     auto* btnSliceOblique = new QPushButton(QStringLiteral("任意"));
-    auto* btnSliceFace = new QPushButton(QStringLiteral("正视"));  // 正视选中切片(E54)
     auto* btnSliceFlip = new QPushButton(QStringLiteral("翻转"));
     auto* btnSliceClose = new QPushButton(QStringLiteral("关闭"));
     sliceLayout->addWidget(sliceLabel);
@@ -551,7 +550,6 @@ void buildWorkbench(QMainWindow& window, geopro::data::LocalSampleRepository& re
     sliceLayout->addWidget(btnSliceFrontBack);
     sliceLayout->addWidget(btnSliceLeftRight);
     sliceLayout->addWidget(btnSliceOblique);
-    sliceLayout->addWidget(btnSliceFace);
     sliceLayout->addWidget(btnSliceFlip);
     sliceLayout->addWidget(btnSliceClose);
     sliceBar->setVisible(false);  // 默认二维，不显示
@@ -559,14 +557,13 @@ void buildWorkbench(QMainWindow& window, geopro::data::LocalSampleRepository& re
 
     // 切片按钮可用性：仅三维 + 有体素时创建/翻转可用；关闭仅在有切片时可用。
     auto updateSliceButtons = [interactionMgr, btnSliceUpDown, btnSliceFrontBack, btnSliceLeftRight,
-                               btnSliceOblique, btnSliceFace, btnSliceFlip, btnSliceClose, sceneView]() {
+                               btnSliceOblique, btnSliceFlip, btnSliceClose, sceneView]() {
         const bool canSlice = sceneView->hasVolume() && interactionMgr->hasVolume();
         btnSliceUpDown->setEnabled(canSlice);
         btnSliceFrontBack->setEnabled(canSlice);
         btnSliceLeftRight->setEnabled(canSlice);
         btnSliceOblique->setEnabled(canSlice);
         btnSliceFlip->setEnabled(canSlice);
-        btnSliceFace->setEnabled(interactionMgr->hasSlices());   // 正视需有(选中)切片
         btnSliceClose->setEnabled(interactionMgr->hasSlices());
     };
     updateSliceButtons();
@@ -584,8 +581,6 @@ void buildWorkbench(QMainWindow& window, geopro::data::LocalSampleRepository& re
                      [addSlice]() { addSlice(SliceAxis::LeftRight); });
     QObject::connect(btnSliceOblique, &QPushButton::clicked, vtkWidget,
                      [addSlice]() { addSlice(SliceAxis::Oblique); });
-    QObject::connect(btnSliceFace, &QPushButton::clicked, vtkWidget,
-                     [interactionMgr]() { interactionMgr->faceSelected(); });
     QObject::connect(btnSliceFlip, &QPushButton::clicked, vtkWidget,
                      [interactionMgr]() { interactionMgr->flipView(); });
     QObject::connect(btnSliceClose, &QPushButton::clicked, vtkWidget,
diff --git a/src/render/interact/InteractionManager.cpp b/src/render/interact/InteractionManager.cpp
index e67fca1..e05a4a4 100644
--- a/src/render/interact/InteractionManager.cpp
+++ b/src/render/interact/InteractionManager.cpp
@@ -1,6 +1,7 @@
 #include "interact/InteractionManager.hpp"
 
 #include <algorithm>
+#include <chrono>
 #include <cmath>
 #include <cstddef>
 
@@ -87,14 +88,27 @@ void InteractionManager::addSlice(SliceAxis axis) {
 }
 
 void InteractionManager::selectByTool(const SliceTool* tool) {
-    for (std::size_t i = 0; i < slices_.size(); ++i) {
-        if (slices_[i].get() == tool) {
-            selected_ = static_cast<int>(i);
-            updateSelectionVisual();
-            safeRender();
-            return;
-        }
+    int idx = -1;
+    for (std::size_t i = 0; i < slices_.size(); ++i)
+        if (slices_[i].get() == tool) { idx = static_cast<int>(i); break; }
+    if (idx < 0) return;
+    selected_ = idx;
+    updateSelectionVisual();
+
+    // 双击切片正视(D40)：同一切片在 350ms 内两次交互 → 视为双击 → 正视。
+    const double now = std::chrono::duration<double, std::milli>(
+                           std::chrono::steady_clock::now().time_since_epoch())
+                           .count();
+    const bool dbl = (tool == lastInteractTool_) && lastInteractMs_ >= 0.0 &&
+                     (now - lastInteractMs_) < 350.0;
+    lastInteractMs_ = now;
+    lastInteractTool_ = tool;
+    if (dbl) {
+        lastInteractMs_ = -1.0;  // 重置避免三连判
+        faceSlice(idx);
+        return;
     }
+    safeRender();
 }
 
 void InteractionManager::closeSelected() {
diff --git a/src/render/interact/InteractionManager.hpp b/src/render/interact/InteractionManager.hpp
index 974196c..486eaa8 100644
--- a/src/render/interact/InteractionManager.hpp
+++ b/src/render/interact/InteractionManager.hpp
@@ -98,6 +98,11 @@ private:
     // 析构进行中：closeAll() 跳过 renderWindow_->Render()（Qt 拆台时窗口可能已半析构，
     // 析构期再 Render 易崩，评审 M3）。
     bool destroying_ = false;
+
+    // 双击切片正视(D40)检测：同一切片在阈值内两次交互(StartInteractionEvent)视为双击 → 正视。
+    //   因 widget 开启交互后独占切面事件，双击靠监听 widget 交互判定，而非 InteractorStyle。
+    double lastInteractMs_ = -1.0;
+    const SliceTool* lastInteractTool_ = nullptr;
 };
 
 }  // namespace geopro::render::interact
diff --git a/src/render/interact/SliceTool.cpp b/src/render/interact/SliceTool.cpp
index 39a6d94..19b92ce 100644
--- a/src/render/interact/SliceTool.cpp
+++ b/src/render/interact/SliceTool.cpp
@@ -78,6 +78,11 @@ SliceTool::SliceTool(vtkImageData* image, vtkRenderWindowInteractor* interactor,
         }
     }
 
+    // 照原型配置(f57291a)：左键拖动=移动切面(默认左键是窗位调整,无用);中键=取值光标。
+    //   切面边缘(margins)拖动可旋转切面 → 任意切片"可任意调整角度"(F25)。
+    widget_->SetLeftButtonAction(vtkImagePlaneWidget::VTK_SLICE_MOTION_ACTION);
+    widget_->SetMiddleButtonAction(vtkImagePlaneWidget::VTK_CURSOR_ACTION);
+
     widget_->On();
     // 保持 widget 交互开启：任意切片可拖动调整角度/位置(F25 '可任意调整')。
     // 监听其交互开始事件 → 触碰本切片即回调 onInteract(上层据此设为选中)。