Through the mechanical test of white sandstone with various degrees of initial damage after treatment of different high temperatures,the paper analyzed the influence of different target temperatures and initial damage on elastic modulus, peak stress and microscopic structure.The results show that elastic modulus and compressive strength of white sandstone affected by initial damage decrease with the increase of temperature.The greater the initial damage, the severer the impact of high temperature on white sandstone.Through the observation by using microscope,the crystal of specimen becomes smaller and incomplete,cuttings is more.In addition,the paper set up the stress-strain curves of white sandstone with different initial damages and temperatures.