Abstract: To analyze the effect of drainage and extraction system on the output effect of a high coal rank coalbed methane well, based on the data of 51 coalbed methane wells in the south of Qinshui Basin similar to the geology conditions of drilling and completion wells, by analyzing the production characteristics of coalbed gas wells, the dynamic control parameters were established, such as the reduction rate of the dynamic liquid level, the amount of deep liquid production per unit, the fluctuation range of the dynamic liquid level, and the time of stopping the well. The relationship between the representational parameters and the average daily gas production volume is shown as follows: the faster the reduction rate of the liquid surface before the desorption, the larger the water inflow of the unit drawdown and the longer the time of stopping well; the more frequently the dynamic fluid level change, the worse the coal bed methane output. In order to realize efficient drainage in the research area, it is suggested to control the depth rate of the liquid level within 6 m/d at the initial stage of drainage; after putting into operation, control the quantity of deep water inflow within 0.05 m³/(d·m); in the stable production stage and the output attenuation stage, control the intensity of discharge and extraction and keep the stability of the liquid level and the continuity of the drainage.