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Aiming at the problem that the SURF image matching algorithm used in binocular stereo measurement is not accurate enough, an improved image matching algorithm based on SURF algorithm is proposed and applied to the binocular distance measurement system. Firstly, SURF algorithm is used to detect and describe feature points and feature vectors. Secondly, reverse feature vectors matching strategy is used to initialize the matching points set. Finally, the PROSAC algorithm is used to select the initial matching point set according to the polar geometric model, and get the final good match set. Experiments show that the improved SURF algorithm has higher matching accuracy and good real-time performance, and the binocular measuring system with improved SURF matching algorithm can achieve More accurate positioning。