With the method of finite element analysis,the temperature field and the thermal-stress field of HgCdTe Infrared Focal Plane induced by CO2 laser are simulated.In bump had been taken into consideration during the process.Theoretical analysis indicates that with the increasing of the laser exerting time,the device′s temperature distribution changes obviously.The thermal-stress damage on the interface between HgCdTe and In bump array is likely to happen before thermal damage.