Abstract: Aiming at the large differences of H2S content in the condensate gas wells in District Ⅱof Gas Field Ⅰof Tazhong area, a high-pressure physical-property experimental evaluation method is proposed. Different amounts of pure H2S gas were added to the on-site separated gas sample, and the on-site condensate oil sample was mixed with the gas sample at a constant produced gas-oil ratio and the samples with different H2S contents were obtained. The experiment was carried out at the formation temperature and the influences of different H2S contents on condensate gas phases were studied. The results show that when H2S contents increase, the contents of CO2, N2, C1—C5 and C6+ in the well fluid decrease; the dew point pressure shows a linear decrease and will decrease by 0.67 MPa every time when the H2S content of the sample increases by 1%; the anti-condensate oil saturation is basically the same, but the precipitation time of the anti-condensate oil is delayed, and the recovery factors of condensate oil and natural gas are both reduced. This is because H2S is a good oil-gas miscible solvent, which can reduce miscible pressure and result in a decrease in dew point pressure and a delay of the condensate oil precipitation, indicating that the presence of H2S is not conducive to the exploitation of condensate gas wells