Abstract: In order to weak the effect of the representative error of sound velocity profile(SVP),a new method,which is used for constructing spatial model of sound velocity and completely reflecting spatial structure of sound velocity,is studied.Two methods for building the local spatial model of sound velocity are given.One is that the model is constructed with SVPs;the other is that the model is constructed with temperature profiles and salt profiles.Both of the two methods can achieve very consistent accuracy and reach about 0.2 m/s in the construction of spatial model.The method is proved to be credible and feasible by an experiment.