Abstract: Test was conducted on the mechanical properties of the limestone specimens from an ore district in Jiaozuo, Henan at high temperature to disclose the regularities of their strength and deformation characteristics varying with temperature.The test results show that, with the temperature rises, all their mechanical parameters varied to different extents.Their compression strength rises from the normal temperature to 500 ℃ and decreases from 500 ℃ to 800 ℃ and their elastic modulus rises  from the normal temperature to 500 ℃ and decreases rapidly from 500 ℃ to 800 ℃.

Key words: Rock mechanics, High temperature effect, Mechanical properties, Experimental study