diff --git a/backend/routes/devices.js b/backend/routes/devices.js
index b2e3525..8734c27 100644
--- a/backend/routes/devices.js
+++ b/backend/routes/devices.js
@@ -45,13 +45,14 @@ async function checkPositionAvailable(
   excludeDeviceId = null,
   transaction = null
 ) {
-  if (!position || position <= 0) {
+  const pos = parseInt(position, 10);
+  if (!pos || pos <= 0) {
     return { available: true, reason: null };
   }
 
-  const deviceHeight = height || 1;
-  const startU = position;
-  const endU = position + deviceHeight - 1;
+  const deviceHeight = parseInt(height, 10) || 1;
+  const startU = pos;
+  const endU = pos + deviceHeight - 1;
 
   const queryOptions = {
     where: {
diff --git a/backend/routes/idleDevices.js b/backend/routes/idleDevices.js
index da2abf5..3b9cab2 100644
--- a/backend/routes/idleDevices.js
+++ b/backend/routes/idleDevices.js
@@ -536,7 +536,9 @@ router.put('/:deviceId/shelve', async (req, res) => {
     }
 
     const deviceHeight = height || device.height || 1;
+    console.log('上架设备 - 位置检查参数:', { rackId, position, deviceHeight, deviceId, existingDeviceId: device.deviceId });
     const positionCheck = await checkPositionAvailable(rackId, position, deviceHeight, deviceId, t);
+    console.log('上架设备 - 位置检查结果:', positionCheck);
     if (!positionCheck.available) {
       await t.rollback();
       return res.status(400).json({ error: positionCheck.reason });
@@ -832,13 +834,14 @@ async function checkPositionAvailable(
   excludeDeviceId = null,
   transaction = null
 ) {
-  if (!position || position <= 0) {
+  const pos = parseInt(position, 10);
+  if (!pos || pos <= 0) {
     return { available: true, reason: null };
   }
 
-  const deviceHeight = height || 1;
-  const startU = position;
-  const endU = position + deviceHeight - 1;
+  const deviceHeight = parseInt(height, 10) || 1;
+  const startU = pos;
+  const endU = pos + deviceHeight - 1;
 
   const queryOptions = {
     where: {
diff --git a/frontend/src/pages/IdleDeviceManagement.jsx b/frontend/src/pages/IdleDeviceManagement.jsx
index d8131c6..13a0506 100644
--- a/frontend/src/pages/IdleDeviceManagement.jsx
+++ b/frontend/src/pages/IdleDeviceManagement.jsx
@@ -183,7 +183,9 @@ const IdleDeviceManagement = () => {
     }
 
     try {
+      console.log('检查U位冲突:', { rackId, position, height, deviceId: shelvingDevice?.deviceId });
       const result = await deviceAPI.checkPosition(rackId, { position, height: height || 1 });
+      console.log('U位检查结果:', result);
       if (!result.available) {
         setShelvePositionConflict(result.reason);
       } else {
@@ -1018,6 +1020,7 @@ const IdleDeviceManagement = () => {
                     placeholder="请输入高度"
                     min={1}
                     style={{ borderRadius: '8px' }}
+                    onChange={handleShelveHeightChange}
                   />
                 </Form.Item>
               </Col>