Abstract: The Zhaozixiu deformed body is located in the northwest of Huaying City,and the city will be in danger directly if the deformed body collapses.After analyzing the geological structure,deformation character,geomorphic evolution,human engineering activities in detail,the author has introduced numerical simulation into the article to study the case of formation mechanism of the deformed body.The study indicates that the deformed body has been gradually formed when the middle-obliquity reverse slope,which contains coal bed,was bended and ripped during the down-cutting of canyon.And human engineering activities,that is,excavating coal,influenced the development of the deformed body to great extent.