Abstract: In order to accurately predict the productivity of asymmetrically fractured gas wells and optimize gas wells fracturing,according to the conformal transformation principle,the productivity computation formula for such wells was established by introducing the gas pressure function and solving the differential equations for gas flow in fractures.This formula was validated by the real data of asymmetrically fractured gas wells in an oil field.The effects of fracture asymmetry on the productivity of fractured gas wells was analyzed with this formula.The results showed that,given the same parameters,the more the asymmetry of fractures,the lower the production of fractured gas wells.When the flowing bottomhole pressure is higher,the production of asymmetrically fractured gas wells is less affected by the asymmetry of fractures,but for the lower flowing bottomhole pressure,the effect is just contrary.So,the fractures should be kept in symmetric distribution along the wellbore to obtain a relatively high productivity of gas wells if it is possible.