Abstract: Based on "three zones" characteristics of flow and retrograde condensation behavior of gas-condensate reservoir, the productivity prediction equation of condensate gas reservoir is established in line with the actual. Firstly,the distribution of condensate oil and gas is divided into three zones: gas flow with no condensate, gas flow with no condensate flow and gas-condensate flow, and the corresponding permeability model is established. On this basis, considering the influence of free gas, free condensate, dissolved gas and dissolved condensate, the productivity prediction equations of condensate gas reservoirs in different regions are established. Finally, combined with the CCE experiments and flow, the two-phase pseudo-pressure, the two-phase Non-Darcy coefficient and average free condensate-gas ratio and the performance are calculated, which is obtained to realize the solution of the productivity equation. By studying the productivity characteristics of different condensate oil content, it is found that compared with lean condensate oil content, the pseudo-pressure of rich condensate gas reservoir is much smaller, and Non-Darcy coefficient is much larger. What's more, the IPR curve has an obvious turning point, making the gas well open-flow capacity significantly reduced. The example proves that the condensate oil precipitation in near-well formation has a great influence on gas well productivity. Even a small amount of condensate oil precipitation will increase the productivity equation coefficient and greatly reduce the productivity. The research has guiding significance for the productivity evaluation of condensate gas reservoirs.