Space weathering plays an important role in the evolution of lunar surface material in the last 3.1 Ga, which includes bombardment of meteorites and micrometeorites, implantation and sputtering of solar wind particles, radiation of solar/galaxy cosmic ray, as well as periodical heating. By analyzing the mechanisms of implantation and sputtering of solar wind particles, vaporization and deposition in micrometeorite bombardment, radiation damage of solar and galaxy cosmic rays, and periodical heating, the thickness, chemical composition and microstructure characteristics of grain rims are related to the difference processes of lunar space weathering. With these analysis, the micrometeorites bombardment and implantation and sputtering of solar wind are thought to be the main source, and radiation of solar and galaxy cosmic rays and periodical heating make little effect on the change of mineral grains properties. Based on the conclusions and comparison of the thickness, chemical composition and microstructure of different types grain rims, the origin of these rims are deduced. Amorphous rim, vesicular rim and the inner part of multi-rim are thought to be formed by the solar wind implantation and sputtering, inclusion-rich rim and the outer part of multi-rim might be formed in micrometeorites bombardment. For the disadvantage in explaining the origin of grain rims depend on chemical property, microstructure analysis of grain rim and simulated experiment are proposed to comprehend the origin of grain rims supplemental.