diff --git a/src/editor/propEditors/BayEditor.vue b/src/editor/propEditors/BayEditor.vue
index 09cd98f..5fc324c 100644
--- a/src/editor/propEditors/BayEditor.vue
+++ b/src/editor/propEditors/BayEditor.vue
@@ -14,6 +14,8 @@ interface DtBay {
     bayWidth: number;
     /** 列偏移 */
     offset: number;
+    /** 列的顶部空间 */
+    topHeight: number;
     /** 每层的高度 */
     levelHeight: Array<number>;
 }
@@ -85,6 +87,7 @@ function applyBasicSettings() {
         const bay: DtBay = {
             bayWidth: widthOfBays,
             offset: 0,
+            topHeight: 0,
             levelHeight: [],
         };
         for (let i = 0; i < numberOfLevels; i++) {
@@ -124,6 +127,12 @@ function updateBayWidth(bay: DtBay, bayWidth?: number) {
     emit("update:modelValue", newValue);
 }
 
+function updateBayTopHeight(bay: DtBay, topHeight?: number) {
+    bay.topHeight = topHeight;
+    const newValue = getModelValue();
+    emit("update:modelValue", newValue);
+}
+
 function updateBayOffset(bay: DtBay, offset?: number) {
     bay.offset = offset;
     const newValue = getModelValue();
@@ -227,6 +236,13 @@ export type {
                             @change="(offset: number) => updateBayOffset(selectDay, offset)"
                         />
                     </ElFormItem>
+                    <ElFormItem label="Bay Top Height" :labelWidth="80">
+                      <ElInputNumber
+                        :controls="false"
+                        :modelValue="selectDay.topHeight"
+                        @change="(height: number) => updateBayTopHeight(selectDay, height)"
+                      />
+                    </ElFormItem>
                 </div>
                 <div>Level Heights</div>
                 <div class="flex-item-fill bay-editor-bay-info-level-height">
diff --git a/src/modules/rack/Rack3dObject.ts b/src/modules/rack/Rack3dObject.ts
index db86e8f..56f1086 100644
--- a/src/modules/rack/Rack3dObject.ts
+++ b/src/modules/rack/Rack3dObject.ts
@@ -25,7 +25,6 @@ export default class Rack3dObject extends THREE.Object3D {
   private static rackHorizontalBarGeometryMap: Map<number, BufferGeometry> = new Map<number, BufferGeometry>()
   private static rackHorizontalBarMaterial: Material = null
 
-  bottomBarHeight = 0.2
   bottomLinkHeight = 0.2
   topLinkDistance = 0.2
 
@@ -297,7 +296,10 @@ export default class Rack3dObject extends THREE.Object3D {
     const heights = []
     for (let i = 0; i < item.dt.bays.length; i++) {
       const bay = item.dt.bays[i]
-      const bayHeight = decimalSumBy(bay.levelHeight)
+      if (bay.topHeight == null || bay.topHeight < 0) {
+        bay.topHeight = 0.5
+      }
+      const bayHeight = bay.levelHeight[bay.levelHeight.length - 1] + bay.topHeight
       heights.push(bayHeight)
     }
     const rackHeight = _.max(heights)
@@ -357,16 +359,15 @@ export default class Rack3dObject extends THREE.Object3D {
     const hBarMatrix: { x: number, y: number, z: number, sx: number, sy: number, sz: number, rx: number, ry: number, rz: number, l: number }[] = []
     distanceX = 0
     for (let i = 0; i < item.dt.bays.length; i++) {
-      distanceY = this.bottomBarHeight
       const bay = item.dt.bays[i]
       for (let j = 0; j < bay.levelHeight.length; j++) {
-        const levelHeight = bay.levelHeight[j]
-        if (distanceY <= 0) {
+        const levelHeight = bay.levelHeight[j] - 0.05 // 0.05为横梁自身高度的一半
+        if (levelHeight <= 0.0) {
           continue
         }
         hBarMatrix.push({
           x: distanceX - rackWidth / 2,
-          y: distanceY,
+          y: levelHeight,
           z: -rackDepth / 2,
           sx: 1,
           sy: 0.8,
@@ -378,7 +379,7 @@ export default class Rack3dObject extends THREE.Object3D {
         })
         hBarMatrix.push({
           x: distanceX - rackWidth / 2,
-          y: distanceY,
+          y: levelHeight,
           z: item.dt.rackDepth - rackDepth / 2,
           sx: 1,
           sy: 0.8,
@@ -388,7 +389,7 @@ export default class Rack3dObject extends THREE.Object3D {
           rz: 0,
           l: bay.bayWidth
         })
-        distanceY += levelHeight
+        distanceY = levelHeight
       }
       distanceX += bay.bayWidth
     }
diff --git a/src/types/Types.d.ts b/src/types/Types.d.ts
index a706e4e..5b9c759 100644
--- a/src/types/Types.d.ts
+++ b/src/types/Types.d.ts
@@ -257,6 +257,7 @@ interface ItemJson extends ItemMetrix {
 
     bays?: {
       bayWidth: number,
+      topHeight: number,
       levelHeight: number[]
     }[]