1. In view of the current situation that most elderly people do not use smart machines, for families with elderly people in their homes, community-related elderly activities (such as fitness, chess, dancing and other community cultural construction) can be published on the smart door lock display screen. The elderly can check the door lock information when they go out and decide whether to participate in relevant community activities. 2. For residential property, provide a unified collection of property fees and utilities for the whole residential area. Users can directly see the business information on the door lock display screen when entering and leaving the house, and complete the payment through password or fingerprint. (The account number of the head of the household shall sign a secret-free agreement with the agency that collects property, water and electricity charges. After the user verifies and confirms the payment information of the door lock, enter the password or fingerprint to complete the deduction. The user can experience a more convenient and easy-to-forget payment method).