diff --git a/src/utils/html_generator.py b/src/utils/html_generator.py
index 8002825..5d3d576 100644
--- a/src/utils/html_generator.py
+++ b/src/utils/html_generator.py
@@ -179,6 +179,7 @@ class HTMLGenerator:
             <button onclick="toggleMold()">显示/隐藏模具</button>
             <button onclick="toggleParting()">显示/隐藏分型面</button>
             <button onclick="togglePointcloud()">显示/隐藏点云</button>
+            <button id="splitBtn" onclick="splitMold()" style="background:#FF5722;color:#fff;font-weight:bold;">分模拆分</button>
         </div>
     </div>
 
@@ -495,6 +496,65 @@ class HTMLGenerator:
                 pointcloudMesh.visible = pointcloudVisible;
             }}
         }}
+
+        // ─── 分模拆分动画 ───
+        let isSplit = false;
+        let splitAnimId = null;
+
+        function splitMold() {{
+            if (!cavityMesh && !coreMesh) return;
+            isSplit = !isSplit;
+            const btn = document.getElementById('splitBtn');
+            btn.textContent = isSplit ? '合模' : '分模拆分';
+
+            // 计算拆分距离：取边界框高度的 40%
+            const bboxDims = geometryData.bounding_box?.dimensions || [100, 100, 100];
+            const splitDist = bboxDims[1] * 0.4;
+
+            // 目标位置
+            const cavityTargetY = isSplit ? splitDist : 0;
+            const coreTargetY = isSplit ? -splitDist : 0;
+
+            // 分型面动画目标透明度
+            const partingTargetOpacity = isSplit ? 0 : 0.3;
+
+            // 记录起始位置
+            const cavityStartY = cavityMesh ? cavityMesh.position.y : 0;
+            const coreStartY = coreMesh ? coreMesh.position.y : 0;
+            const partingStartOpacity = partingMesh ? partingMesh.material.opacity : 0.3;
+
+            const duration = 800; // ms
+            const startTime = performance.now();
+
+            if (splitAnimId) cancelAnimationFrame(splitAnimId);
+
+            function animateSplit(now) {{
+                const elapsed = now - startTime;
+                const t = Math.min(elapsed / duration, 1);
+                // 缓动函数 (easeInOutCubic)
+                const ease = t < 0.5 ? 4 * t * t * t : 1 - Math.pow(-2 * t + 2, 3) / 2;
+
+                if (cavityMesh) {{
+                    cavityMesh.position.y = cavityStartY + (cavityTargetY - cavityStartY) * ease;
+                }}
+                if (coreMesh) {{
+                    coreMesh.position.y = coreStartY + (coreTargetY - coreStartY) * ease;
+                }}
+                if (partingMesh) {{
+                    partingMesh.material.opacity = partingStartOpacity + (partingTargetOpacity - partingStartOpacity) * ease;
+                    if (isSplit && t >= 1) partingMesh.visible = false;
+                    else partingMesh.visible = true;
+                }}
+
+                if (t < 1) {{
+                    splitAnimId = requestAnimationFrame(animateSplit);
+                }} else {{
+                    splitAnimId = null;
+                }}
+            }}
+
+            splitAnimId = requestAnimationFrame(animateSplit);
+        }}
     </script>
 </body>
 </html>