Abstract: Transport properties of non-equilibrium argon plasma were analyzed by using Chapman-Enskog method at low and high pressure and for various temperature-difference between electrons and heavy species.Electorns and heavy species were trenled as two different gases and a generalized Suha equation was used to calealate the plasma composition.The results show that the transport properties of no-equilibrium plasma are far different from that of local temperuture equilibrium(LTE) plasma.It will result in greater error if the transport properties for LTE plasma are applied to to no-equilibrium plasma.