The reason why there exists Bouguer correction error is analyzed in this paper. It is pointed out that one of the reasons for causing Bouguer correction error is that the coefficient of stone slab correction is not exact. A new formula of new stone slab correction and a simpler and more exact formula of Buoguer correction are given in this paper. In view of the fact that microcomputers are popularized day by day, it is suggested that the improved remanent spherical model should be used in stone slab correction and topographic correction.