Hi @Wentao Liu ,
This is an English language forum, I suggest you try to transform your problem to English and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.
Then based on your description, I suggest you refer to this support about how to open Excel in new instance:
https://gorilla.bi/excel/open-multiple-instances-excel/
Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.
Hope the information is helpful.
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