diff --git a/services/ptable_parse/ufs_ptable.cpp b/services/ptable_parse/ufs_ptable.cpp
index b4cee23a86f38c2680163081545400987ea4150f..0c6e7e0178ccffa462e1246597ee14a2c470bddf 100644
--- a/services/ptable_parse/ufs_ptable.cpp
+++ b/services/ptable_parse/ufs_ptable.cpp
@@ -45,13 +45,15 @@ uint32_t UfsPtable::GetPtableExtraOffset(void)
 }
 
 // avoid u disk being recognized as a valid gpt lun device
-bool UfsPtable::IsUsbPath(const char* filePath)
+bool UfsPtable::IsUsbPath(const uint32_t lunIndex)
 {
+    char lunIndexName = 'a' + lunIndex;
     const char* targetUsbString = "usb";
     const char* targetXhciString = "xhci";
     char linkBuf[READ_LINK_BUFFER_LENTH] = {0};
-    ssize_t retSize = readlink(filePath, linkBuf, READ_LINK_BUFFER_LENTH - 1);
-    LOG(INFO) << "readlibk " << filePath << " retSzie " << retSize << ", linkBuf is: " << linkBuf;
+    std::string filePath = std::string(PREFIX_SYS_CLASS_BLOCK) + lunIndexName;
+    ssize_t retSize = readlink(filePath.c_str(), linkBuf, READ_LINK_BUFFER_LENTH - 1);
+    LOG(INFO) << "readlink " << filePath << " retSzie " << retSize << ", linkBuf is: " << linkBuf;
     if (retSize > 0 && (strstr(linkBuf, targetUsbString) != nullptr || strstr(linkBuf, targetXhciString) != nullptr)) {
         return true;
     }
@@ -101,7 +103,7 @@ void UfsPtable::SetDeviceLunNum()
             break;
         }
 #ifndef UPDATER_UT
-        if (CheckDeviceLunRemoveable(lunIndex) || IsUsbPath(ufsNode.c_str())) {
+        if (CheckDeviceLunRemoveable(lunIndex) || IsUsbPath(lunIndex)) {
             LOG(ERROR) << "device " << ufsNode << " is removable, may be a u disk";
             break;
         }
diff --git a/services/ptable_parse/ufs_ptable.h b/services/ptable_parse/ufs_ptable.h
index 96ae8fe7fd5021f3b0a383469a6c8ca914de5202..f6ee78090190d434458ed82295978e7feb53147c 100644
--- a/services/ptable_parse/ufs_ptable.h
+++ b/services/ptable_parse/ufs_ptable.h
@@ -78,7 +78,7 @@ public:
     uint8_t *GetPtableImageUfsLunPmbrStart(uint8_t *imageBuf, const uint32_t lunIndex);
     uint8_t *GetPtableImageUfsLunGptHeaderStart(uint8_t *imageBuf, const uint32_t lunIndex);
     uint8_t *GetPtableImageUfsLunEntryStart(uint8_t *imageBuf, const uint32_t lunIndex);
-    bool IsUsbPath(const char* filePath);
+    bool IsUsbPath(const uint32_t lunIndex);
 };
 } // namespace Updater
 #endif // UPDATER_UFS_PTABLE_H
\ No newline at end of file