Douyin live streaming chain can be realized in the following ways:

1. Brand live streaming room cooperation: Brands can find influential live streamers on Douyin and cooperate with them to open live streaming rooms to introduce and promote products and attract users to buy.

2. Spokesperson live streaming: Brands can invite celebrities or spokespersons to do Douyin live streaming, and increase users' awareness of the brand and willingness to buy by introducing and demonstrating products.

3. Store live streaming: Brands can organize employees or partners to do live streaming in major stores, introduce store environment, product features, promotional activities and other information, and attract users to shop in stores.

4. Community marketing: Brands can interact with users by establishing Douyin fan groups, share product information and promotional activities, and promote user purchases.

5. Create a brand matrix: Brands can establish multiple accounts on Douyin, including official accounts, product accounts, spokesperson accounts, etc., and form a brand matrix through the positioning and content production of different accounts to expand brand influence.

It should be noted that Douyin product promotion chains need to have certain operational capabilities and marketing strategies. Brands need to formulate appropriate product promotion strategies based on their own situations and target audiences. At the same time, they must ensure the quality of products and services to enhance users' trust and satisfaction with the brand.