You should check the "Industry Guidance Catalogue" issued by the country this year on the Internet, or go to the tax bureau to ask for a tax application form. In the attached instructions for filling out the form, there is the "National Standard Industry Classification". According to the above description, you will know what industry your business scope should belong to.

In addition, if you are engaged in "import and export, wholesale and commission agency of certain goods", you should be classified as "wholesale industry".