Abstract: We prove in this paper the blow-up theorem of the generalized solution.and ts L²mass concentration theorem on the set of blow-up points near the blow-up time of the Cauchy problem fr nonlinear Schrodinger equations and give the structure of the set of the blow-up points and the estimates on the blow-up time.Furthermore we extend and improve some results in [2] and [5].

Key words: Schrodinger equation:Cauchy problem, mass con centration