Compared with other metal edged cutting, grinding research is immature on aspect of grinding mechanism and experimental research. With the development of computer technology, FEM is widely used in research of metal cutting process. In this paper, macro simulation of surface grinding is researched with the software MSC.Dytran, and the corresponding experimental study is carried out. On the basis of discussing the simulation cases, the simulation result, especially, grinding force, are analyzed. The simulation and experimental result are basically consistent with the theoretical result.