Abstract: Following the discussion of regional-geological characteristics of the northern part of Ningsia,it is indicated that the earthquake-generating structures for the Pingluo quake (M=8.0) of 1739 is held to be NNE-striking Huanghe River fault lying at the Yinchuang-Pingluo area.This paper is an analysis of the characterized preparation the shock in terms of a generalized focal model and an elucidation of the spatial position and characteristics for the structural elements.