Abstract: Based on information collected on the ground by multi-ultrasonic sensors, this paper resorts to the fuzzy control algorithm to issue a voice message for the blind to avoid obstacle by processing information collected. This system adopts ultra-low power MSP430 single chip microcomputer as main control unit, the peripheral device contains five ultrasonic sensors to gather omnidirectional road information.After the detailed analysis of road information, it can guide the blind on the way forward and the appropriate speed by issuing voice messages so that to realize the function of obstacle avoidance for the blind.