In order to compare microstructure of lunar soil and lunar soil stimulant

formative processes and five grain type of lunar soil are introduced. We analyze microstructure of lunar soil through lunar soil photos. There is a composition test on pozzolan that is taken as main materials of lunar soil simulant. Microscopic image analysis tests on pozzolan have been done. Test and analysis results show that there are agglutinates in lunar soil. Agglutinate grains take on branching form of organization and closed cell and have metallic iron globules. Main component content of pozzolan is similar to that of lunar soil. Pozzolan crushed show obvious angular

slightly rod-like and little peak value of aspect ratio

which are similar to lunar soil. But complexity factors have little deficiency

which account for pozzolan as simulant materials have not enough coarse and angular.