The smart card water meter (hereinafter referred to as the water meter) is an IC card intelligent instrument series product launched by Huaihua Jiannan Machinery Factory Co., Ltd. The smart card water meter adopts the most advanced sensing and sampling technology in the world. It uses the most reliable microcomputer to read and write data from the smart card, record data, and collect real-time water flow data. Then, the water information is transmitted to the water supply department through the smart card. It has the characteristics of small size, light weight, low power consumption, high precision, strong anti-interference ability, high integration, good reliability, and easy installation and use. It mainly provides modern management of water use for households, industries, and other industries to urban water supply departments.