In order to analyze the drainage system's influence the production capacity of the coalbed methane well,based on the actual drainage data of the coalbed methane vertical well in Shizhuang South Block of Qinshui Basin,the production capacities of the coalbed methane wells under different drainage rate were compared and an analysis was conducted on the drainage system in different drainage stage. The results showed that the fast drainage rate would reduce the radius of the drainage,would cause a quick sensiti...