For the question of applying high-pressure water injection to increase gas extraction efficiency by increasing the permeability of water to drive gas action,an independently designed gas desorption experimental measuring device was used under the condition of extal solution invasion.The law of water effect on gas desorption was obtained after water invasion through experiment for the first time.The results show that water’s later invasion not only can make the quantity of gas desorption greatly reduced,but also can make gas desorption end early.Therefore,when evaluating the applications of high-pressure water injection to increase gas extraction efficiency,we should take water damaging effects on gas desorption into account.