In order to optimize the process parameters of aspherical lens molding process, a two-dimensional axisymmetric model is established by MSC.Marc software. Based on five-element generalized Maxwell viscoelastic model, a finite element simulation of the molding process of D-ZK3 glass materials is carried out. The changes in equivalent stress of glass preform and dies, and the influence of molding temperature, molding rate, and friction factor on the equivalent stress are analyzed. The results show that the equivalent stress at the edge of the lens is larger than that at the center of the lens, and the equivalent stress at the center point of the upper surface is greater than that at the center point of the lower surface. The equivalent stress of the lens and the die increases with the increase of molding rate and friction coefficient, and decreases with the increase of molding temperature. The equivalent stress of the die is larger than that of the lens. Orthogonal test shows that the molding temperature and molding rate are the main factors affecting the equivalent stress of the glass preform. Combined with practical application, the most suitable molding parameters are molding temperature of 580 ℃, molding rate of 0.1 mm/s, and friction factor of 0.2.