Abstract: This paper,based on condensate gas reservoir characteristics, presents a method for determining the law of condensate distribution and predicting condensate gas well's optimum output. The first,the combination with condensate gas filtration characteristics has built and inferred in detail the unsteady filtering equation in porous medium. By using the two-phase pseudo-pressure function of condensate oil-gas,the pressure distribution equations have been fetched for three kinds of typical boundaries in condensate gas reservoir,that is,an infinite outer boundary,a finite closed boundary and finite boundary with the constant pressure. And has built the relations between pressure and pseudo-pressure,and the law distributed condensate oil content,when gas well is producing from the reservoir. Using the data of the condensate content change with pressure in constant-temperature,the distributive characterization is defined under producing. Under drawing Inflow Performance Relationship Curve (IPRC)of condensate gas well is considered the curve's reliability. Some important behavior factors are obtained by using the steady-test data of gas well. To combine IPRC of gas well with the distribution condition of condensate content in formation,the condensate gas well's optimum output is selected. By means of example well A,combination this paper presented theory with the method,the method has systematically provided for defining condensate gas well's IPRC and optimum output.