With the invention and use of railway locomotives, ships, airplanes and various industrial machines, more engineering problems have emerged. Three major mechanics are important basic courses for many engineering majors in our school, which are closely related to other basic courses. For all majors of civil engineering, the study of specialized courses needs mechanical knowledge as the basis. In addition, mechanics is a specialized course in the entrance examination for some engineering graduates. Therefore, mechanics plays an important role in the study of engineering majors.