In order to protect the safety of the patients beng implanted cardiac pacemakers,without restriction of personal freedom but diagnosing the disease at the same time,effective positioning is conducted on the patients.Based on a 16-bit single-chip MSP430 introduced by U.S.Texas Instruments(TI),through research and analysis of operating system μC/os-Ⅱ,in which the positioning task is desiged,the system is convenient to users and also promotes the development of remote mobile monitoring system in telemedicine of China.