本文研宄唐山余震活动时空分布特征,提出唐山余震活动可以分为四个时期和三个余震活动亚区。文中讨论了这一分布特征与震源区地质构造、深部结构以及主震前后地面形变特征的关系。最后指出,主震后应力场的重新分布以及膨胀-流体流动理论可以作为唐山余震成因的一种物理解释。 In this paper, we study the spatiotemporal distribution of aftershocks in Tangshan, and propose that aftershocks in Tangshan can be divided into four periods and three aftershocks. The paper discusses the relationship between this distribution feature and the geological structure, deep structure of the source area and ground deformation before and after the main shock. Finally, it is pointed out that the redistribution of stress field and the expansion-fluid flow theory after mainshock can be used as a physical explanation for the genesis of Tangshan aftershocks.