Abstract: Data used to establish velocity field mainly come from velocity spectrum.Influencing factors of velocity are complicated, and all the methods used to acquire interval velocity from velocity spectrum have certain limitations,so there exist many abnormal data in velocity data set.When analyzing data with colocated Kriging method, both distance influcence and direction infiucence of data points in grids can be taken into account, therefor random velocity errors in velocity field can be removed and accuracy of velocity data can be improved.This method was applied to process the average velocity data of layer T6 in one basin,and very good results have been achieved.