Aptitude control of medium water temperature and water level in HIFU medical treatment system XU Hui,LIU Feng Abstract: To satisfy HIFU medical treatment system request,an aptitude control system of medium is stated on the basis of analysis of conventional water temperature and water level single control mode and existing problems。The hardware design of system , control project and principle are described emphatically。Then the control principle chart of water temperature and water level,partial program flow chart are given。The emulational experiment result shows that the system adjusts placidly and receives well effect。 Keywords: water vesica、sensor、PWM、PID、aptitude control