In order to evaluate the rationality of motorcycle front ventilation plate design and the heat dissipation effect of engine body, the flow field analysis of a motorcycle is conducted by CFD method, and the optimization research is also conducted based on the flow field analysis results. The front ventilation plate with better heat dissipation performance is selected for detailed optimization.The results show that when the grid angle of the front ventilation plate is 6.8 °, the average velocity magnitude on the cylinder head surface is the best, and the average temperature of the cylinder head surface is the lowest. As the grille angle continues to increase, the surface velocity magnitude of cylinder head decreases and the average temperature increases, which is not conducive to heat dissipation. Based on the grille inlet angle of 6.8 degrees, the industrialized technical scheme of the front ventilation plate is carried out. The simulation and experimental verification show that the overall heat dissipation of the industrialized technical scheme is significantly improved when compared with original structure, and the average cylinder head temperature is reduced by about 35 ℃. The research results can be used as a theoretical reference for motorcycles cooling optimization scheme selection and vehicle development.