Abstract: Three different parts are obtained from ethanol extract of Ramulus mori,which are extracts of petroleum ether (Ⅰ),EtOAc (Ⅱ) and n-BuOH (Ⅲ),respectively.The qualitative analysis of extracts is done.Furthermore,the antiinflammatory activities of the extracts are studied.The results suggest that the part Ⅰ shows obvious antiinflammatory activity.