Abstract:The control problem of autonomous communication relay of microrobot cluster in multiple obstacles enviroment was studied. According to the characteristic of small size of microrobot, the low-power infrared communication method was used to realize the infrared communicatin among microrobots by employing carrier sense multiple access. On the basis of the infrared communication, the communication relay control model was established , which is based on spring-damper system, and the corresponding movement controller was designed to realize the communication relay of microrobot cluster. The effectiveness of this control method was verified by simulation results.