The meter is a taxi cab operating fee of special intelligent instrumentation, with the development of electronic technology, taxi meter technology are improving and enhanced. Domestic taxi meter has experienced four stages of development. From the traditional entirely by mechanical components of mechanical, electronic unmature to half an electronic circuit to replace some mechanical components taxi meter, Again from integrated circuit type to the current SCM system design of taxis on the meter. This system is based on the meter, STC89c52 taxi by 1602 LCD screen and the operation data displayed, and with the speed of A44E composed by detector.