Laboratory tests are made to study the mechanical properties of coal-serial mudstone under different temperatures by using the rock mechanics test system RMT－150B and high and low temperature environmental chamber GD－65/150. The effects of complete stress-strain curve

peak stress

peak strain

elastic modulus

deformation modulus and Poisson's ratios of mudstone at different temperatures are analyzed. The results show that

there are differences at different temperatures in mechanical properties of mudstone. As the temperature increases

peak stress and peak strain decrease in different amplitudes; peak stress decreases from 9.153 MPa in 25 ℃ to 8.271 MPa in 55 ℃

and a 9.6 percent decline; peak strain decreases from 11.002×10-3 in 25 ℃ to 8.249×10-3 in 55 ℃

and a 25.0 percent decline. Elastic modulus decreases gradually with the increasing temperature. Deformation modulus increases with the increasing temperature. Poisson's ratio decreases gradually with the increasing temperature; and the relation between various parameter variables and temperature is obtained. Research results provide a theoretical basis for the rock control in deep high temperature soft rock roadway.