Abstract：Salt rock is regarded as the ideal host rock for nuclear waste disposal due to its advantageous geological conditions and physico-mechanical properties. Study shows that nuclear wastes still have strong radiation energy，and make the surrounding rock heavily heated after many years of underground disposal. So the study of the physical and mechanical properties of heated salt rock is important and essential to ensure the safety of nuclear wastes disposed in salt rock. Through a series of tests for heated salt rock at different temperatures ranging from 20 ℃ to 240 ℃ in this paper，several conclusions are generated as follows. (1) The ultrasonic velocity of salt rock decreases with the rising of temperature，and the the ultrasonic velocity and the temperature are of exponential relation. (2) Both the uniaxial compressive strength and the axial strains of salt rock increase with the rising of temperature，while the modulus of deformation turns to the opposite direction. (3) The characteristic of plastic deformation and strain softening becomes distinct at high temperatures，and through regressive analysis，a relation between the uniaxial compressive strength and the temperature is obtained. (4) The values of the cohesion and the internal friction angle of salt rock increase with the rising of temperature，and the strength equations of salt rock at 20 ℃，60 ℃，and 120 ℃ are obtained. (5) The peak shear strength and the ultimate friction strength of salt rock both increase with the rising of temperature，and the relation of shear strength and the temperature is obtained.
