本文采用二维平面应变问题的有限单元法,对唐山地震前华北冀中断块坳陷地区的“应力窗口”进行了数值模拟。初步讨论了模拟区的应力集中部位与介质杨氏模量、压应力值、主压应力取向、边界约束条件变化的关系,根据模拟区地震活动与唐山大震前“应力窗口”的时空分布特征,粗略地模拟了邢台余震区“应力窗口”显示、消失的过程。 In this paper, the finite element method of two-dimensional plane strain problem is used to simulate the “stress window” of the North China-Hebei Interrupted Depression before the Tangshan earthquake. The relationship between stress concentration area and Young’s modulus, compressive stress, principal compressive stress orientation and boundary constraint conditions in the simulation area is discussed. According to the spatial and temporal distribution of seismicity and simulated stress window before the Tangshan earthquake , Roughly simulating the “stress window” in Xingtai aftershock area to show and disappear.