Aiming at the problem that the traditional running track monitoring system is easily affected by the environment, which leads to the poor accuracy of monitoring results, this paper proposes the design of running track monitoring system based on KNN algorithm. This study uses the RF sub module to capture the image captured by imx179 camera, control the sub module to process the image data, and transmit information through PCI bus, uses control sub module to process the image data and transmits information through PCI bus. In addition, the module of upper and lower computer is used to process track information, and the tracking results are displayed by indicator light, and KNN algorithm is used to recognize running posture and build running equation. The experimental results show that the maximum error of running trajectory monitoring in the front and back angles of the system is within the acceptable range, and the monitoring results have high accuracy.