Abstract: Based on the coordinates of 30 GPS base stations, the noise characteristics of GPS time series are determined by AIC and BIC noise model estimation criteria respectively. The characteristics of GPS time series noise model are compared and analyzed. Determine the impact of the degree. The results show that the GPS station coordinate sequence noise model mainly shows the characteristics of FN+WN, PL and FN+RW+WN noise models; the influence of different noise models on the GPS station speed estimation is relatively small, but the U component is the most obvious; In addition, the influence of RW on station speed uncertainty can not be neglected. It is of great significance to correctly obtain the actual uncertainty of model parameter estimation and correct the noise component for the reasonable application of GPS coordinate time series data.