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For infrared distance and ultrasonic detection range and the actual distance difference is big, the problem of intelligent brake control is not strong, was designed and implemented based on monocular vision range of vehicle brake assist system, the system hardware is mainly composed of image acquisition module, the embedded microcontroller processor, and the composition of electronic brake module. By ranging algorithm based on monocular vision software programming, and complete the test on the Matlab platform, the experiments of vehicle to 35 km/h to obstacles, make in 20 ~ 70 m for the calculation of the actual distance range, monocular camera pitching Angle measurement between 88°~90°, and for real-time measuring distance ahead, and through the data exchange between auto electronic control unit for auxiliary control of vehicle brake. The experimental results show that the measured distance and system in distance were within 70 m, the arithmetic average relative error is around 2%, the vehicle stop location away from obstacles in 4.5 m or so, this system meet the real-time requirement the vehicle intelligent auxiliary brake.