In the paper, the GPS speed measurement principle of smart phones is explained, and two experimental scenarios are designed to evaluate the speed measurement accuracy of smart phones, namely the static data simulation dynamic speed measurement experiment and the low dynamic speed measurement experiment. The experimental results show that the accuracy of dynamic velocity can reach dm/s by using the Doppler measurement principle, in the low dynamic test experiment, the velocity results of the smart phone and the combined navigation device are in line with each other at the dm/s level, and there is a certain correlation with the acceleration of the carrier