The thermal effect of thin-disk laser has a significant impact on the laser beam quality and laser efficiency.Seeking effective methods to achieve the compensation of laser therma l effects has always been an important subject in the field of high-power laser research.Based on ANSYS fini te element method,the temperature distribution,thermal stress distribution and the maximum end-defor mation of the end-pumped Yb:YAG thin disk laser are analyzed in this paper.In order to compensate the thermal e ffect of thin disk laser,the mechanical deformation caused by the pressure applied on the end of thin disk cr ystal is used to offset the thermal strain produced in crystal.Using this method,the compensation of the t hermal effect is realized while completing the installation of the thin-disk crystal.The effects of two differe nt installation methods on the thermal effect compensation of thin disk laser are analyzed and compared.The results sh ow that the thermal lens effect of thin disk crystal is obviously improved by using three fixed points installat ion method,while maintaining the total pressure generated by the installation.In addition,with the increase of thin-disk crystal′s thickness,the compensation effect will be worse by applying the extern al load.