Abstract: It made use of 3DEC numerical simulation software to establish the coupled thermal mechanical model of deep roadway surrounding rock, combined the Morris global sensitivity analysis method that it cancalculate "elementary effect" of every parameters in turn and get their mean and variance by changing the value of only one parameter at a time.Then,according to the value of μ and σ, It could tell the effects of rock thermal conductivity, specific heat, heat exchange coefficient of tunnel wall, the air temperatureinside the cave, the temperature of surrounding rock and linear thermal expansion coefficient on surrounding rock deformation output value and the interaction with other parameters.The results showed that:the linear thermal expansion coefficient, the temperature of surrounding rock and the air temperature inside the cave are the most sensitive factor of deformation of roadway; the rock thermal conductivity, specific heat, heat exchange coefficient of tunnel wall are not very sensitive to deformation of roadway; parameters affecting the deformation output value, the linear thermal expansion coefficient has the largest interaction with other parameters, what is more, when the interaction of one parameter with other parameters is very big, the effect of the parameter on deformation output may not be a great value; thermodynamic parameters sensitivity sequence of the 3 selected position is roof, floor, two sides.