diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index 568fcf9..97f42cc 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -113,7 +113,7 @@ export default class RightMenu {
     this.addEvent(window, 'resize', this.destroyMenu.bind(this))
     // 页面点击时销毁菜单栏
     this.addEvent(document, 'mousedown', (e) => {
-      const hasMenu = e['path']?.some((node: HTMLDivElement) => node === menu)
+      const hasMenu = (e['path'] || e.composedPath())?.some((node: HTMLDivElement) => node === menu)
       if (!hasMenu) this.destroyMenu()
     })
   }
@@ -278,13 +278,24 @@ export default class RightMenu {
     // 添加二级菜单
     if (opt.children && opt.children.length) {
       const ul = this.renderMenu(opt.children)
+      const parentMouseLeaveListener = () => li.removeChild(ul)
       li.addEventListener('mouseenter', (e) => {
         li.appendChild(ul)
+        li.parentElement?.removeEventListener('mouseleave', parentMouseLeaveListener)
         layoutMenuPositionEffect(li, ul)
       })
       li.addEventListener('mouseleave', (e: MouseEvent) => {
         if (!e['toElement']) return
         let curr = e['toElement']
+
+        if (li.parentElement && curr === li.parentElement && (e.offsetX < 0 || e.offsetX >= li.offsetWidth)) {
+          // fix 存在滚动条时，从左右两侧移入子菜单
+          li.parentElement.addEventListener('mouseleave', parentMouseLeaveListener, {
+            once: true,
+          })
+          return
+        }
+
         while (curr) {
           // 如果路径里存在 ul 标签, 就不需要销毁
           if (curr === ul) return
diff --git a/packages/core/src/utils/index.ts b/packages/core/src/utils/index.ts
index 5529db7..bf50f88 100644
--- a/packages/core/src/utils/index.ts
+++ b/packages/core/src/utils/index.ts
@@ -110,9 +110,24 @@ export const layoutMenuPositionEffect = (
 
   const layoutToTop = () => {
     let y = baseY
-    // 尝试向上布局，判断菜单最顶端是否超出屏幕上边缘（视窗高度）
+    // 尝试向上布局，判断菜单最底端是否超出屏幕下边缘（视窗高度）
     if (menu.offsetHeight + y > window.innerHeight) {
-      y = baseY + baseH - height
+      const topY = baseY + baseH - height
+      if (topY >= 0) {
+        // 可以向上布局
+        y = topY
+        return y
+      }
+      // 上下都放不下时，使用向上、向下两种方式中更高的区域+滚动条的形式
+      const bottomHeight = window.innerHeight - baseY
+      const topHeight = baseY + baseH
+      const isBottom = bottomHeight > topHeight
+      const menuHeight = Math.max(bottomHeight, topHeight)
+      const menuMaxHeight = Math.floor(menuHeight - 5)
+      y = isBottom ? baseY : baseY + baseH - menuMaxHeight
+      menu.style.maxHeight = `${menuMaxHeight}px`
+      menu.style.overflowY = 'auto'
+      return y
     }
     return y
   }