Laboratory test has been done by using the dynamic triaxial test machine in order to study the damage evolution of frozen aeolian soil in the west of Liaoning Province under dynamic loading. The constitutive relation and damage evolution formula of frozen soil are established

and the dynamic evolution curve between damage variable and strain is sketched. At the same time

pertaining to the at initial stage of damage of frozen aeolian soil

the microstructure is observed by using the scanning electronic microscope (SEM). The results show that the process of damage of frozen aeolian soil can be divided into three stages. In plastic damage stage

the speed of damage growth is fast

and the increase of damage variable is non-linear. In micro-crack damage stage

the damage growth is relatively flat and smooth

and the relation between damage variable and strain is approximately linear. The interior micro-cracks appear in the middle of sample. From the middle to the ends of in the sample

the micro-cracks are in the from of circular growth. Through transfixion and collection of cracks

the inclined cracks come into being and enlarge step by step.