In this study, using teleseismic events recorded at 10 national permanent broadband seismic stations (ISC), from 2014 to 2017, the map of Moho depth changes and the ratio of the longitudinal wave to shear wave velocity (Vp/Vs) at the Moho boundary in the northern part of the Zagros zone is calculated using the Zhou and Kanamori methods. To calculate the receiver functions, the iterative deconvolution in the time domain of Ligorria and Ammon was used and the teleseismic events with an epicentral distance of 25 to 90 degrees with magnitude larger than 5 were used. The results show the crust thickness near the Iranian plateau and in the Arabian plate edge is about 35 - 40 km and increases to 53 km beneath Sanandaj-Sirjan Zone.