Aiming at the issue of poor performance of 66% oil and gas wells in Zhongjiang gas field, it is found through the experimental study on the mechanism and flowability of oil and gas wells, because of the existence of condensate oil, some of the foaming agent with liquid loading form emulsion structure, only part of foaming agent can play the role of carrying liquid. Condensate oil content increases by 10%, liquid carrying volume of foam drainage decreases by 40% to 60%. The effect of foam drainage can only be improved by increasing the amount of foam agent. The formula of the filling agent of condensate oil gas wells is deduced and the results of the field test show that the formula is in line with the actual situation. Liquid carrying volume of two test wells increases by 80% or more and gas production increases by 45% or more, which has the value for promotion and application.