With the intensification of global population aging, With the global aging population growth the rapid increase of the sub healthy population causes the extensive needs of family care. However, traditional medical care center is not enough to satisfy the demands of the people. Therefore, the design of a set of real-time family care system is an important topic for the future of the health care system. Since the concept of the Intra-Body Communication has been put forward, the development of portable medical equipment and medical monitoring systems has improved rapidly. By analyzing the characteristics of Intra-Body Communication and the restrictions of medical equipment, we proposed the idea of energy-efficient family medical monitoring system of wireless, and elaborated the system's principle of work. The construction of this system is aim to further promote the development of medical monitoring system and provide security for the healthy development of body society. © Sila Science.