Abstract: For the QoS problem of IEEE802.11DCF，an enhanced adaptive scheduling distributed EASDCF mechanism is proposed.This paper provides differentiated services through the largest contention window and retry limit，guarantees the real-time service prior access channel with higher probability，also makes packet drop rate sensitive service to be a reliable guarantee.Simulation results show EASDCF classification strategy has the very good effect.So that the performance of overall throughput in wireless local area network has enhanced，and enables the resources to obtain a more reasonable use.