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s: In order to ensure that the blind or the visually impaired people travel independently and solve the difficulty of traveling, it is necessary to design a blind auxiliary product with low cost and high precision, which can be widely used. Analyzed the methods of improving the range precision and reducing the dead zone, the blind guide vehicle system is designed. The system consists of ultrasonic ranging and voice broadcast. The ultrasonic probe is used to detect the obstacle distance and azimuth as well as the road pits. The electrodes in front of the vehicle detect the road surface water and processing signals by STM32 microprocessor. Using a higher clock frequency to improve the ranging accuracy, with the temperature sensor for temperature compensation to further ensure accuracy; through the installation of multiple probes and pan and tilt to reduce the rotation of the blind spot, and then broadcast traffic information prompt the user by the text-to-speech chip SYN6288 and its external circuit. Through the design and testing, as a result of the rotation scan detection, can basically cover the front, 5-400cm fan-shaped area. Ranging resolution of distance detection up to 1cm.