A novel optical burst assembly technique proposed,based on map rules and a dynamic threshold mechanism called ATQ-DT.How to map the IP quality of service(QoS) to burst priority was resolved by the map rules,and how to efficiently allocate assembly capacity among classes belonging to the same priority was answered by ATQ-DT,which determines the maximum share for each class.Simulation results show ATQ-DT with TQ-map can most remarkably improve the packets loss probability (PLP) to support QoS.