Gravity gradient tensor was introduced in this study, and the finite element method was

applied to the twodimensional gravity gradient tensor forward. In order to prove the correctness of the

finite element method, the authors comparatively studied the forward result and analytical solution of

a twodimensional body whose cross section is the combination of two rectangles. It can be seen that

the forward result is well consistent with the FEM numerical solution. Through forwarding the two

dimensional body which has irregular cross section and homogeneous density in each element, the

authors have concluded that the complex twodimensional body can be forwarded by mesh

generation to approximate irregular borders and by assigning different densities to different elements.