Abstract: On the basis of phase transition characteristic of condensate gas flow in porous medium, established flow equation for condensate oil-gas in porous medium, and introduced dual-pseudo pressure of condensate oil-gas to linearize the flow equation. Then established three-zone condensate oil-gas flow model, obtained analysis solution of pseudo-pressure distribution for condensate oil-gas, and maked certain the interpretation method of build-up test for condensate gas well. Through the application of pressure build-up practical information on the condensate well, it's proved the three-zone model is valuable in condensate gas field exploitation.