Abstract:Testing study is made on the basic mechanical property of thenardite salt rock,which includes uniaxial compressive,indirect tensile and angle changed shear tests. Through the testing and analysis,it is found that thenardite salt rock is a kind of soft rock,the strength of which is low and the deformation is distinct. Moreover,the uniaxial compressive deformation and damage of thenardite are different from other rocks during four deformation phases. With variation of shearing angles,the strength curve equation of thenardite and calcium thenardite salt rocks are deduced.