The experiment and three-dimensional finite element simulation of single diamond abrasive grinding SiC_p /Al composites are carried out. The effects of grinding parameters on grinding force and surface morphology of SiC_p /Al composites were analyzed. The analysis results show that the grinding force decreases with the grinding speed increasing, the breakage of SiC particles is alleviated, the coating effect of aluminum matrix is enhanced, and the surface morphology integrity is good. The grinding force increases with the grinding depth increasing, SiC particle breakage is significantly enhanced, more pits and holes are formed on the surface, and the surface quality is poor. The simulation results are consistent with the experimental results, which shows that the model can be used to optimize the grinding process parameters.