According to the general standard of earthquake magnitude(GB17740-2017), we analyzed 476 the intermediate and deep-focus earthquakes in Xinjiang and the adjacent area from 2009 to 2017. Then we got 13601 m_b samples, 12035 m_B(BB)samples, the regression equations, and the calibration function of m_b and m_B(BB).Through magnitude residual statistical analysis and by calculating the station site response, we concluded that the station bedrocks magnify the station site response, which causes the large magnitude offsets, such as sandstone and limestone and sand soil, So the magnitude offsets of XKR, HTA, ATS and KSZ are relatively large. By comparing with the body wave magnitude from NEIC, we found that magnitudes from our results are greater than that from NEIC's by 0.42. Moreover, the offsets tend increasingly with the increase of focal depth.