My inventory asset in Balance sheet report's difference is more that 270 K, I really do not know what happen?

Hello there, limin. Let me mention the importance of the financial period when generating inventory tracking reports in QuickBooks Online (QBO).

One possible reason for the discrepancy between the values on each report could be different reporting periods. We can verify this by following the steps below:

1. Login to your QBO account.
2. Go to the Reports tab and search for the Balance Sheet Summary report.
3. For the Report Period, select Custom and choose the same date as the Inventory Valuation report period. 
4. Click Run Report.

You should find your inventory asset totals under Other Current Assets.

In addition, here's how to download your Inventory Valuation Summary report by exporting it to your desired file format:

1. Go to the Reports tab and search for the Inventory Valuation Summary report.
2. From the Report Period dropdown, select Custom, and choose the specific date.
3. Click Run Report.
4. Select the Export icon next to the Print icon.

Furthermore, you may find this article helpful if you want to send your report by email on a recurring schedule: Set schedule and email information for a memorised report.

Always know that you can come back to this thread if you need further assistance with your inventory asset or other QuickBooks-related queries. We're more than happy to assist. Take care.