Abstract: Taking the Niutitang black shales of Lower Cambrian in Sichuan basin as an example, high temperature and high pressure isothermal adsorption experiments were conducted at35℃, 50℃, and 65℃. Based on the adsorption potential theory, the adsorption data were processed, and the adsorption potential and adsorption volume of methane on shales were calculated. Then the adsorption characteristic curves were plotted, from which the adsorption isotherms models were predicted. The results show that effect of temperature on the adsorption characteristic curves is greater, but such an adsorption is a physical one, its acting force is mainly dispersion force independent of temperature, therefore, the adsorption characteristic curves of methane on shales are of invariance of temperature, and the curves in different temperatures appear to be superposition each other. The adsorption prediction model can forecast gas adsorption capacity at other temperature and pressure conditions by adsorption data at one temperature as required. The case study indicates that the prediction results fit well with the experimental data, and the average relative error is less than3%