Abstract: The effects of the chamber volume,the air statement index in chamber,the resistance in pipe network,and the field comprehensive resistance on the characteristic values in pressure regulation process are analyzed systematically in this pater.The results show that the chamber volume,the air statement index in chamber effect obviously the pressuer change period and have little effects on the pressure change range, the resistance in pipe network effects markedly both the pressure change period and pressure change range;the field comprehensive resistance effects the pressure change process,with a minimum change period existed.