The Moya(2000)method was used to jointly invert the source spectrum and the site response of 654 earthquake events with M_L ≥ 2.5 recorded by Hebei Seismic Network since 2010. These events are from 168 stations with the actual inversion results of 151 seismic stations. The results show that each station has a different degree of site amplification effect within the frequency of 1~20Hz,The site response of various bedrock platforms varies with frequency is more complicated. Most of the station bases are Quaternary sedimentary stations. The site response shows obvious amplification effects in the low frequency range 1~8Hz,and fast attenuation trend in the high frequency band 8~20HZ. Selecting M_L ≥ 2.0 seismic data recorded by Hebei Seismic Network since 2017,with statistical analysis of the single earthquake magnitude of each station and the average earthquake magnitude of the network,we has obtained a new local M_L gauge function representing Hebei. In response to the Tangshan M_S5.1 earthquake of July 12,2020,we use the site response results obtained in this paper to eliminate the amplification effect of the station. Then we use the current gauge function and the newly obtained gauge function to recalculate the magnitude of a single station. The results show that the magnitude deviation has decreased.