The drain character and hydraulic linking are studied by analyzing the property of water-bearing and water-resisting, groundwater flowing and hydrochemistry character in Libi Gorge anticline. According this, the character of methane enrichment controlled by hydrological geology in the region is researched. It is indicated that Libi Gorge belongs to block anticline gas pool sealed by water pressure. In shallow layers, the water-bearing layers are controlled obviously by atmospheric water. The groundwater flows actively, drains nearby, but has no influence on the coalbed methane; in middle layers, the coal-bearing layers contain water weakly and the water flows slowly. The water has a roof and bottom enclosed effect on gas in water network ; in deep layers, the layers contain water weakly. The groundwater stops running and has a bottom enclosed effect on gas in water network. The most of faults are pressure faults, upper of them is water guiding, lower of them resisting. They enclose the gas by pressure. In addition, it is important for thickening rock character to enclose the gas.