To open a citrus fruit category on Doudian, you first need to make sure you have the relevant sales qualifications and health certificates, then log in to the Douyin store backend, click "Product Management" to enter the product settings page, select "Add Product", fill in the product information and upload product pictures and descriptions that meet the requirements, select the "Fruit" category and fill in detailed product attributes and specifications information, and finally submit for review and wait for the platform to review and pass. At the same time, you also need to pay attention to maintaining product quality and service attitude, increase attention and sales, thereby improving the store level and reputation, and better carry out citrus fruit sales business.