Abstract: Research work has shown that taking advantage of the broadcasting nature of wireless channel network coding across multicast communication can significantly reduce system delay. In multi-Source multicast scenario, with the condition that each source has priori knowledge of other sources, existing transmission schemes can insure systematic delay minimum. In this paper, we analyze the delay performance of network coding for multisource-multidestination single-relay scenario without the above mentioned condition. Moreover, we extend the scenario to the multi-relay scenario, simultaneously proposing the MR-OPP-NC scheme based on network coding and opportunistic relaying selected strategy. We apply outage probability to the quantification of the delay performance of Network Coding with decode-and-forward (DF) strategy. Simulation results confirm that in contrast to opportunistic relaying scheme without network coding MR-OPP-NC scheme proposed can get significant delay performance gains.