The bonding process will affect the actual performance of the phase corrector. However, its mirror surface is often damaged during the development process. In this paper, the characteristics of the correction surface shape and the damage to the mirror after the bonding process are analyzed, and it is inferred that the excessive difference in the thermal expansion coefficient between the mirror glass and the connecting column head material causes excessive residual stress in the corresponding position of the correction surface after high-temperature curing. A numerical model is established to simulate the thermal stress of the joints, and it is used to select a stud material with a thermal expansion coefficient similar to that of mirror glass and an adhesive with a lower curing temperature to reduce the residual stress. The stigma material is replaced with 3Cr13, which has a thermal expansion coefficient that matches the glass material (K9). The experimental results show that the static surface shape of the phase corrector has been significantly improved after high-temperature curing, and the correction surface has not been damaged after multiple experiments.