Abstract: The deliverability equation of single-phase gas has its limitation.The pressure and pressure square deliverability equations are widely used at present,but they are simplified in various pressure interval.Though stricter processing method has been adopted,the pseudo-pressure deliverability equation of single-phase gas is not suitable to multiphase percolation.Therefore,the function of generalized pseudo-pressure is hold up,and corresponding deliverability equation for multiphase percolation is derivated.The formulary validity is tested and verified by an example.