In this paper we investigate the development of localized and periodic perturbations of a small intensity in a supersonic boundary layer for Mach number M=2.5. Propagation speeds of localized disturbances are estimated. It was established that the speed of forward front is more than the speed of the back front. Maximum mass flux disturbances were observed at y_(max) where (ρU(y))/(ρU_∞)≈0.55-0.65, that will be coordinated with experimental data. In the case of localized perturbations, it is established, that in the field of the forward front oscillations are arising in process of the wave packet movement downstream and it's amplitude growth on time.
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