JD.com's promotion rules are based on different promotional activities and marketing strategies.

The following are the common promotional rules of JD.com under normal circumstances:

1. Coupons: JD.com will issue coupons of different denominations, which consumers can use when shopping. The usage rules usually include designated products, minimum consumption amount, validity period, etc.

2. Full reduction activities: Consumers can enjoy full reduction discounts when they reach a certain amount of money when shopping. The specific full reduction amount and discount strength will depend on the activity.

3. Second kill: JD.com will regularly hold second kill activities, and specific products will be sold in the form of rush purchases during a specific time period, with limited quantities. Consumers need to successfully rush purchase within the specified time to enjoy the second kill price.

4. Group purchase: Consumers can purchase the same product with other users through group purchase activities to enjoy group purchase prices.

In addition to the above rules, JD.com will also set other preferential rules according to different promotional activities. For specific promotion rules and event information, it is recommended that you check the latest event details and instructions on the JD official website or APP.