Abstract: The problem of dimensional deviation caused by material shrinkage in the hot forming process of fused deposition manufacturing (FDM) should be solved. Thus, contour compensation method that based on the initial design model is carried out to reduce dimension deviation to improve dimension accuracy. A series of ellipsoidal cylinders, regular prisms are designed by orthogonal test. Two contour compensation methods are proposed, and the two methods are used to compensate the contour of the initial design model of the test pieces. The results show that there are differences in the forming dimensional accuracy of the elliptical cylinder, the triangular prism and the square prism for the examples in this article. Both of the two methods can improve dimensional accuracy. Dimensional accuracy of regular elliptical cylinder, regular triangular prism and square prism is promoted in different degrees by the same compensation method. The second has better compensation effect than the one.