Abstract: This paper proposes a new method to provide QoS (Quality of Service) in IEEE 802.11e EDCA (Enhanced Distributed Channel Access). Several slots are assembled together to form a super slot, and every slot in the super slot is assigned for a given priority traffic to send packets. The slot assignment is done according to the traffic priority. This new method guarantees the high priority stations have better throughput, less MAC delay and less packet dropping probability than the low priority stations. Compared with the contention window differentiation proposed by IEEE 802.11e EDCA draft, this new method has many advantages such as increasing the throughput, decreasing the packet dropping probability and reducing variety of the high priority traffic throughput when the number of stations increases. This new QoS method is better than contention window differentiation and applying this method can greatly improve the performance of IEEE 802.11e EDCA.