Abstract: Velocity signals collected by GPS are decomposed by Mallat algorithm of Wavelet.According to the relationship between the maximum wavelet coefficient modules and the singularity signal,the breaking dots are detected.Based on Wavelet's Time-frequency analysis characteristics,the velocity signals collected by GPS are spread to time-frequency space,and different signals of different movement states are correspondingly analyzed.Considering the parameters of breaking dot's size,position,number,mean velocity and zero velocity continuance time,the differentiate condition are finally proposed.Compared with the actual bus movement state,it is very effective to use Wavelet to analyze the signals collected by GPS.