Abstract:The earthquake (M=6.0) of April 6, 1932 took place at the Huangtu gang, Macheng, Hubei province. The Yingshanjian-Sidaohe fault is a seismic breaked structure. Because of Yingshanjian-Sidaohe fault is a locked-up structure in the Huangtugang narrow block of upper well of Macheng-Tuanfeng abyssal fault, thereby, during the Macheng-Tuanfeng fault dislocated reverse-left-laterally, much of elastic strain energy was accumulated on the shear locked up structure and at last it was caused to be break spread, there occurred the earthquake of magnitude 6.This is a strong seismic pattern of rock breaked on secondary small fault which is control led by major fault.