When selling things on Douyin, the address is displayed in red to attract the user's attention and make it easier for them to notice the seller's address information. Red is a striking color that can stand out from a lot of information. The purpose of this is to increase users' attention to the seller's address, increase purchase intention and transaction success rate.

At the same time, red also represents enthusiasm and vitality, which can leave a deep impression on users and increase brand memorability.

Therefore, when selling things on Douyin, displaying the address in red is a marketing strategy designed to attract users' attention and promote transactions.