Transit of surface waves through defects in steel surfaces has been viewed in this paper. The form of registered signal is changing as result of complex wave processes in the area of defects. The received signals are digitized and phase-spectral analyses are have been made. If there is a defect in the surface of the samples it shifts the phase of the Rayleigh wave. The phase shift depends on the size of defects. The results obtained can be used for the creation of innovative technologies with improved resolution for testing of surface and subsurface defects in the practice of non-destructive testing.