中文摘要：

主要分析了煤吸附水的机理及其对吸附瓦斯的影响。分析表明，煤对水分子的吸附从本质上是由于水分子与煤表面分子相互吸引的结果，它们之间的作用力主要包括、，anderwaals力和氢键。vander Waals力来源于原子和分子间的色散力、取向力（静电力）、诱导力和交换力4种作用。由于水分子与煤表面分子的作用力比较强，煤中水分的存在降低了煤的甲烷吸附量。

英文摘要：

This paper studys micro-mechanism and the influence of water to adsorbing gas. By analysis it can be concluded that micro-mechanism of coal adsorbing water is the results of attractions of water molecules and coal molecules each other. These attractions include van der Waals attractions between molecules and hydrogen bond. Van der Waals attractions include dispersion force, orientation force （Electrostatic force）, inducement force, exchange force. Because attractions between water molecules and coal surface is quite strong, the moisture content of coal will reduce adsorptive quantity of gas in the coal.