根据断层深部不均匀滑动反演方法，利用６期大地形变资料，反演计算了唐山地震断层在震前、震时、震后共５个不同时间段的运动状况．其结果体现了地震断层由震前加速运动、震时突发错动到震后松弛、调整，趋于稳定的运动过程．进而利用地震断层的滑动与应变能的关系，估算了唐山地震的复发周期． According to the inhomogeneous sliding inversion method of deep faults, the motion of the Tangshan earthquake fault in 5 different time periods before, during and after the earthquake was calculated by using 6 sets of geodetic deformation data. The results show that the earthquake fault is accelerated by the pre-earthquake, and when the earthquake suddenly breaks down, it relaxes, adjusts and tends to stable movement. Based on the relationship between the slip and strain energy of seismic fault, the recurrence period of Tangshan earthquake is estimated.