Abstract: A new method of calculating the copy field by use of two broadband guide sources and the warping transform,in case that a little environment parameters is known in range-independent shallow water environment,is presented.This method,based on normal modes estimation,yields the replica field by calculating the position information and phase information of the field respectively.Also,compared with the traditional method which calculates the copy field by using the priori knowledge of the environment to model the field,it can avoid the dependence on environment parameters and the field model.Warping transform is used to estimate the modes and Linear Bartlett processor is used to give the simulation results.Good results is obtained when the Signal-Noise ratio is higher than 10¹5 dB.