With automatic charging function, a household has one card and one card. The user gives the gas to the gas management department. The management department writes the gas purchase amount into the IC card through the computer management system. The user inserts the IC card into the IC card gas meter, and then it can Get permission to use the gas you purchased. The IC card can record the operation status of the gas meter. Under the management machine or management software, the total gas consumption, the total gas purchase amount, and the on-off valve status of the meter are managed.