On the basis of analyzing the mechanism of residual subsidence of old goafthe model of calculating residual subsidence of gobs was deduced by combining the results of ruptured rock mass.Meanwhile the relationship were analyzed between the coefficient of residual subsidence and the characteristic of overburden stratamining thicknessmining depth and building load.The research results show that while mining thickness is samethe shallower mining depth isthe larger coefficient of residual subsidence isand there is larger surface residual subsidence in the future;While mining depth is samethe larger mining thickness isthe smaller coefficient of residual subsidence is;When the propotion of constuction loads to overburden stress is the samethe smaller the mining depth isthe larger the augmenter of subsidence coefficient isand has more effect old goafs.