According to the sections of sintering crunode of two metal fibers, which are oval-oval geometry structure in different directions, the oval-oval model is developed based on the traditional surface diffusion mathematical model. This model is numerically solved by level set method to achieve the 2D simulations of two sintering metal fibers. Moreover, the 3D reconstitution method is proposed to depict the complex 3D geometrical structure of two sintering metal fibers. The 2D simulations and 3D reconstitution results of two metal fibers with the fiber angle 30° well agree with the experimental ones, which imply that the 2D model and 3D reconstitution method are correct. In addition, the numerical simulation results show that the growth rate of sintering neck along the directions taken from the bisector of obtuse angle to the bisector of acute angle is increased.