Chukar is a kind of very important wild economical bird species. The research to the eggshell is very use-rnful not only in biology but also in economics. The structure of eggshell of Chukar is the same as the fowl. Thernstructural changes of the inner and outer surfaces, the transverse section of the eggshell, and the outer sur-rnface of its membrane during incubation had been observed by scanning electron microscopy (SEM), Therernwas a great change happened for the surface structrue of eggshell and its membrane during incubation. Therntortoise-shaped crackles became smaller and longer,and the fibres of the membrane became thinner and short-rner. At the same time ,the transverse section of eggshell also became thicker.