文章综述了大震前地形变、震前小震综合断层面解、波速异常、地电阻率、地震活动性等一些前兆量在空间上呈现象限性分布的观测事实及其理论论述,这种现象已被用来预测地震危险区;文章指出,研究震前一些前兆量的象限性分布对揭开震源应力场的变化过程有着重要意义。 This paper summarizes the observed facts and theoretical exposition of some precursors such as the deformation of the earthquakes before the earthquake, the general solution of the complex earthquakes in the small earthquakes, the anomaly of wave velocity, the resistivity of the earth and the seismic activity in space. Has been used to predict the danger zone of earthquake. The article points out that studying the quadrant distribution of some precursors before earthquakes is of great significance to reveal the changing process of stress field in the source.