Abstract: It is difficult to calculate the open flow rate due to the precipitation of condensate oil during the production of condensate gas reservoirs, meanwhile, the multi-well capacity test is adopted to obtain open flow rate, resulting in high production cost.It is especially important to study the method of calculating the open flow rate of condensate gas wells under different formation pressures.By converting the volume of condensate oil into the volume of equivalent gas, according to the volume of equivalent gas, the open flow rate of existed gas wells in study area can be calculated by the exponential and binomial formula. They have a good exponential relationship with the open flow rate and formation pressure. The open flow rate of new wells can be calculated by the regression formula. According to the actual situation of the study area, they are similar when the field productivity test results are compared with the predicted values, which proves that the method can be used to calculate the open flow rate of condensate gas wells, and it has certain reference significance for other gas reservoirs to carry out similar works.