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Kaup and Newells revised inverse scattering transform for the derivative nonlinear Schr(o)dinger(DNLS)equation is investigated.We compared it with a more reasonable approach proposed recently,which is rigorously proven bly the Liouville theorem.It is conduded that Kaup and Newells revision is only suitable for giving single-soliton solution and can not be generalized to multi-soliton case.