This paper took the grinding force in the heavy load honing as the object to research, it mainly analyzed the influence of the grinding force to the material removal rate. First the mathematical model of grinding force was established from starting with the honing pressure. Then the mathematical model of material removal rate was established according to the relationship between material removal volume and honing pressure. Finally the influence of the honing pressure to the material removal rate was analyzed with the aid of software. The results of this paper have important theoretical significance to optimize the processing technology of heavy load honing and further enhance the machining precision and the honing efficiency.