Ultrasonic water meter is a new type of water meter based on ultrasonic time difference principle for flow measurement and display. It belongs to the new product and technology of intelligent water meter. All electronic water meter is made of industrial grade structural materials, high-performance electronic components, micro power circuit technology, programming technology and digital technology. Compared with the mechanical water meter, it has the obvious advantages of high precision and sensitivity, wide range ratio, two-way flow measurement, no need to set parameters, no mechanical moving parts, no wear, very low pressure loss, not easy to leak, good reliability, long service life, arbitrary angle installation, convenient digital remote transmission and so on. It is a revolutionary product subverting the traditional mechanical water meter. It can be applied to household water metering and water information remote reading management in cities and towns.