To find the customs codes of AliExpress products, first log in to the AliExpress backend, enter the product management page, find the "Commodity Customs Declaration Information" column in the product details, click the "Edit" button, and find the "Customs Code" column in the pop-up editing page. If the code has been filled in, just check it directly; if it has not been filled in, you can click the "View Customs Code" button, enter the product keyword or description to search, find the corresponding code, fill it in and save it. In addition, you can also seek help from AliExpress's Help Center or contact customer service.