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ODMRP protocol is an on-demand multicast routing protocol in mobile ad hoc network. This paper presents the on-demand multicast routing protocol with multipoint relay (ODMRP-MPR) which is based on ODMRP. ODMRP-MPR induces the multipoint relay technique to reduce the control overhead, obtain high scalability and effectively solve the unidirectional link problem of wireless communication. At the same time, ODMRP-MPR reserves the key merits of ODMRP such as high throughput and energy efficiency in conditions with frequently changing topology. We evaluate ODMRP-MPR performance with ODMRP for ad hoc networks via extensive and detailed simulation.