Abstract: With the advancement of aerospace remote sensing systems, high-precision medical imaging equipment and other devices, optical components, as the core parts of numerous high-end apparatuses, have been applied in an increasingly wide range of scenarios. In this paper, finite element simulation is carried out for the precision molding process of phosphate glass to analyze the effects of temperature and pressure parameters on molding quality. Firstly, the geometric profile of the lens is constructed, and the material parameters of phosphate glass specimens are acquired. Secondly, a three-dimensional model is established, and the obtained material parameters are imported into MSC.Marc for simulation calculation. Finally, the influence laws of process parameters on the molding quality of optical lenses are summarized, and the optimized parameters are adopted to guide subsequent experiments. The results indicate that the optimal process conditions are a heating rate of 0.75 ℃/s, heating temperature of 560 ℃ and applied load of 1.1 MPa. Under such conditions, the molded lens obtained via finite element simulation exhibits low residual stress and superior molding quality. This study can provide a certain reference for optimizing the process parameters and improving the manufacturing precision of phosphate glass lenses.