At present

most data transmission protocols do not make full use of the broadcast nature of wireless channels.To address this problem

this paper proposes a network coding based opportunistic routing protocol (NCOR). Firstly

by analyzing the end-to-end transmission cost of the network

a mechanism for constructing the optimal forwarding set is proposed to minimize the transmission cost. Then

NCOR performs cooperative coding transmission among nodes in the forwarding set to ensure transmission reliability. Finally

the transmission reliability of NCOR is analyzed theoretically. Simulation results show that NCOR can be applied to different link environments

and it can greatly reduce the network energy consumption while ensuring reliable transmission.