The lamellar models of the crust structure of three profiles are achieved in this paper by means of the reverse of the velocities of Rayleigh wave swarms from Kashi to Gaotai and the phase velocities of Rayleigh wave from Kashi to Urumuqi and from Urumuqi to Gaotai.The results show that the frequency curves of scatterness for the three profiles and the crust structure are different each other,which means there is a very obvious transverse variation of the crust structure in Northwestern China.