Based on network coding relay cooperative Interleaver Division Multiple Access(IDMA) system, the performance of the system with Turbo code in multi-path channel is analyzed. The multiple access method of adopting different interleavers for different users and the network coding relay cooperative mechanism are studied, the multi-path channel and Turbo code are added into the system to establish simulation environment. The simulation results show that in the multi-path channel, Turbo code has improved the BER performance of network coding relay cooperative IDMA system greatly.