In recent years,the strong motion network has obtained lots of records in Jiangsu Province. The spectral ratio curves of velocity response of strong motions from 22 stations are calculated by using horizontal vertical spectral ratio method in this paper. The site types of stations are classified by using the predominant period and spectral type characteristics of the curves,which are also compared with the engineering geological data of four typical strong motion stations. Compared with the traditional site classification method,our results show that the site feature classification based on the spectral ratio method can highlight the seismic response characteristics of different sites. The predominant period and amplification characteristics of the spectral ratio curve are consistent with the site geological data,which reflects the site response characteristics of the station better.