Douyin live broadcast room can talk about cash back upon delivery. In Douyin live broadcast room, the anchor can attract viewers to buy by introducing products to the audience and mentioning promotional activities such as cash back upon delivery. The characteristic of the live broadcast room is real-time interaction, and the audience can communicate with the anchor through comments, gifts, etc. Therefore, the anchor can inform the audience of the cash back policy of the product upon delivery during the live broadcast to increase the audience's desire to buy. However, the anchor needs to abide by the relevant regulations of Douyin to ensure that the promotional content is true and accurate, and does not involve false propaganda and fraud. At the same time, the audience must also remain vigilant, shop rationally, and have a certain understanding and judgment of promotional activities such as cash back upon delivery to ensure their own rights and interests.