Abstract: In order to achieve QoS guarantee in MANET,a new MAC protocol with conflict centralized-solving method is put forward.It first eliminates all the conflicts in control slot then assigns channels to nodes using queue-reservation mechanism.The protocol makes the node attain FIFO characteristic,and cuts down the back-off delay remarkably,by which it can enhance the fairness and stability of the MAP.In addition,the CCS-QR protocol can adjust the access order according to different service,which can improve QoS guarantee.The analysis and simulation indicate the new protocol presents good performance on access efficiency,data throughput and access delay.