In the bonding structure of the optical-mechanical system, for researching the influence on lens of the adhesive’s curing shrinkage, the viscoelastic model is used for adhesive’s simulation, and the theory solution can be gotten from the constitutive equation. The method of equivalent temperature and the Finite Element Analysis (FEA) soft ANSYS is used for simulating the shrinkage to analyze the influence on the surface figure error. Compared with the elastic model, the viscoelastic model has its advantages. Change the curing time for analyzing the influence on the lens. The analysis result shows that the simulation result fit the theory solution well, and the viscoelastic model can better describe the relationship between the time and the final shrinkage stress. Moreover, it can better simulate the generation of shrinkage stress. In regard to the same adhesive, through prolonging the curing time properly, there is the smaller influence on the surface figure error of the lens, so it can prolong the time for reducing the shrinkage stress.