One of the important parameters in simulating seismic records at high frequencies is the Fourier amplitude spectral decay parameter In this paper, an attempt has been made to explain the seismicity of this region by determining the kappa factor and quality factor for Kermanshah region. In this study, the acceleration data of the 2017 Sarpol-e-Zahab aftershocks have been used. The best linear fit for kappa in terms of epicenteral distance for the horizontal component was determined as K = 0.0005 R + 0.034 and the quality factor relationship was obtained as Q = 88.6 f 0.8. Kappa relationship indicates an increase in its value with increasing epicenteral distance. The relationship of Q is also consistent with the high seismicity of this area.Also was showed at high frequencies the effect of spectral decay is more.