In order to study the fundamental pattern and feature of moderately strong earthquakes in the north of Sichuan Province and its vicinity,the division of seismicity periods and feature of earthquake migration of north-east seismic belt in the studied region were analyzed.It is pointed out that seismicity were mainly attributed to north-east seismic belt in the studied region.It is consid-ered that there will be possibility of the occurrence of M≥6 earthquakes in the regions of Maowen-Beichuan-Wenchuan,Dayi-Tianquan-Baoxing and Lixian-Tianshui-Wushan in the coming years.