A novel retransmission approach in wireless broadcasting based on network coding（NCWBR） was presented

the key point of which was to combine different lost packets with network coding to achieve high efficient retransmission.Theoretical analysis reveals that the approach can ensure the solvability in the receiver nodes

and has better retransmission performance.Simulation results indicate that

comparing with existing approach

NWCBR can effectively reduce the average number of transmissions and improve the transmission efficiency.