Finite element method is used to simulate the process of the pressing in compression molding of glass lens array. Five-element general Maxwell model and Tool-Narayanaswamy shift function are incorporated into the finite element method to describe the viscoelastic property and the heat flow characteristic of glass at high temperature, respectively. The filling ratios of mold cavity of glass lens array in different locations and the effect of temperature and molding velocity on cavity filling ratios in lens array are emphatically analyzed. The simulation result shows that cavity filling ratios are lower at the edge of the mold than that in the middle of the mold, and the higher temperature and molding speed will lead to higher cavity filling ratios.