Under the 25~150℃ and 25~100 MPa at the simultaneous heatingup and pressurerising conditions, the deformation experimental results of middle rank coal from Ordos Basin show that the strength of 25 oC/25MPa condition is much lower than the strength of coalrock under other pt conditions. Under experimental deformation conditions, crack and microcrack are the primary characteristics of the deformation of the coal and rock performance. The characteristics of deformation of coalrock are diverse under different pt conditions. Along with the decrease of pt，the extension of crack of coal samples decreases gradually coupled with the penetration of crack increasing. The developing of crack in deformation coal sample is equable comparatively and has directed apparently. The extension of crack has a large scale along with the increase of strain. The decrease of pt of natural coal leads to the transformation from toughness to brittleness. A mass of coaled methane desorbs and reserves in the unthread microcrack during the early and middle stage of transformation reservoir. The penetration and reservoir of coal rock become superior along with the slow decrease of pt, which leads to convenient transportation and preservation of coaled methane. However, coal rock forms the breakdown of crosscutting during the late stage of transformation, which leads to losing of coaled methane. This may become the main reason that decreases the adsorption of coaled methane with low level of evolution and porosity.