Based on surface micro-groove texturing on cylinder liner, a mixed lubrication model of cylinder liner-piston ring was established, and the influence of micro-groove parameters on the lubrication performance was calculated by using MATLAB programming. The results show that the surface groove can form good film pressure, which effectively improves the lubrication state between cylinder liner and piston ring. And with the angle of micro-groove increases, the minimum oil ratio increases gradually, and the lubrication effect is getting better and better. Meanwhile synthetically considering the lubrication performance of friction and engine oil consumption performance, the best angle of micro-groove is affirmed as 60°. The changing of area density has great influence on the dimensionless friction force nearby the TDC, but has little influence on the other areas.Then the optimal area density is Sp=0.15. The dimensionless friction force increases continually with the increases of depth-to-width ratio, when e increases from 0.025 to 0.15, the average dimensionless friction force increases 2.3 times, and if the depth-to-width is too large, the lubrication effect will be weakened, the optimal depth-to-width ratio is as e=0.05~0.08.
