Multicasting is a communication service that allows a source to efficiently transmit copies of data packet to destination nodes for meeting end-to-end QoS(Quality of Service)requirements of real-time applications and its algorithm must be NP-completeness.QoS provisioning generally assumes more than one QoS measure which implies that a routing algorithm may have multiple constraints:delay,delay-variation and cost,etc.After research of related algorithm for constructing the multicast tree,a delay and delay-va...