The working system acts as an important component, its performance and reliability are the main critria to measure the comprehensive function of a Bulldozer. Since Bulldozers are used in difficult conditions, it is required that the earth-moving shovel arms should be strong and hard enough. If calculated by the general mechanics of material, the reliability of its stress can not be accurate. With the development of engineering and computer technology, the complicated approach of finite element has come to be widely employed. It has laid foundation for the further design of the earth-moving shovel, setting up a module by employing. Three-dimensional software Pro/E first, then analysing and calculating its stress by ANSYS software to know its stress and deformation state.