Abstract: This paper discusses the seismogeological background of the Songpan-Pingwu earthquakes, their seismicity, the characteristics of tectonic stress field and the conditions of seismogenic structures in the region under investigation.Judging from the location of epicenters of three strong shocks along the Huya fault, the contour of their synthetic isoseismals and the agreement of fault plane solutions with the occurrence of Huya fault, the authors come to a preliminary conclusion that the studied events were caused by the dip-slip displacement of NNW trending Huya fault with a slightly sinistral component and under the action of nearly EW trending tectonic stress field.