In order to improve the methane storage in porous media under mild conditions, the storage characteristics of methane in Mil⁃101 (Cr) were studied based on adsorption water method.MIL⁃101 (Cr) was prepared and characterized. Methane adsorption experiments were performed at 271.15 K and 0～7.0 MPa with different water contents. The particle size of the synthesized material was uniform, grain size range was 100～150 nm, and almost without impurities. The pore size was mainly distributed in the range of 1.7 nm to 3.6 nm. The results of adsorption experiments show that: MIL⁃101 (Cr) adsorbs more methane under the condition of water, and with the increase of the water content, the amount of methane adsorption increases. The pressure required for nucleation in porous media is higher than that for bulk system, and the greater the water content is, the higher the critical pressure is. The MOF material used in the experiment still has good adsorption capacity after repeated regeneration. The research results have certain significance for increasing the natural gas storage capacity.