For resolving the difficulty that some patients need to be cared in a long term at home，this paper presents a case of distant wireless medical monitoring system based on GPRS．The system uses GPRS network to transfer data by point-to-multipoint which has high speed and low cost；uses a portable design so it is convenient and flexible；uses various anti-disturbance measures to improve the reliability of the system．In addition，the system is real-time online which ensures the medical care center to dynamically get the various pathological parameters of the presents，and to deal with emergencies timely．