Abstract：Based on the data of veritical well's exploration and development of coal bed methane ( CBM) in Panzhuang block, the paper adopts the Visual Modflow 4. 2 software to respectively simulate, with the contrast analysis method, the hyadraulic pressure transmission law of No. 7 well, No. 14 well and multi-well during the drainage and mining process, among which No. 7 well has a great difference between the original permeability and the modified permeability and No. 14 well with smaller difference. The results show that during the drainage and mining process of a simgle well, when the coal reservoir's original permeability is relatively low and of much difference with the modified permeability, the path of hydraulic pressure transmission is an oval center around the mineshaft under the influence of the heterogeneity of a coal reservoir and the maximum horizontal principal stress. With the drainage and mining time increasing, the ratio of long radius and short radius is gradually increasing; the path is approximately circular; in the initial stage, during the process of multi-well drainage and mining, the regional groundwater is lower irregularly under the influence of the heterogeneity of a coal reservoir. Withe the development of drainage and mining, the underground water has an overall downward trend and form an inter-well interference, which become the key factor of high yield in the block.

Keyword：coal bed methane;production;water pressure;numerical simulation;