Based on 49 digital seismograms recorded on 73 seismic stations of Jiangsu Digital Seismic Network，the paper uses Atkinson's method to calculate the inelastic attenuation coefficient of the Jiangsu area. We find that the frequency-dependent Q in the Jiangsu region is. We also use Moya's method to invert the 63 stations' site responses. The results show that the site responses of the 25 stations in Jiangsu are approximately 1 at a range between 1Hz and 20Hz，which is consistent with their basements on rocks. The response curves of the site response of the 14 underground stations are similar to each other. Their site responses show an amplification at low frequencies and minification at high frequencies. The calculation of the Brune model on the waveform data of ML≥2.5 earthquakes from Jiangsu Digital Seismic Network between October 2010 and May 2015 in terms of seismic source parameters of 58 seismic waves shows that there is good correlations between seismic magnitude and other source parameters such as seismic moment，source radius and corner frequency，while the correlations between seismic magnitude and stress drop，the stress drop and source radius are not so good.