Mobile Ad hoc NETworks (MANETs) plays an important role in emergency communications, where network must build up temporarily and quickly. Since the nodes move randomly, routing protocols must be very effective and reliable guarantee successful packet delivery. Based on the data delivery structure, most of the existing multicast routing protocols can be divided into two folders: tree-based and mesh -based. The authors observe that tree-based those who have a high efficiency and forwarding low consumption of bandwidth and have a poor robustness, since only one connection is established between two nodes. As tree based multicast routing protocol, MAODV (Multicast Ad hoc On-Demand Vector) shows excellent performance in lightweight ad hoc networks.