IPoIB is a protocol that supports traditional Ethernet over InfiniBand networks, allowing IP applications to run on InfiniBand networks. We realize IPoIB on the domestic parallel system to improve the performance of IPoIB on the system, we also propose four optimization methods, namely, reordering packets, optimizing memory copy, tuning network parameters, and avoiding delayed acknowledgement. Practice shows IPoIB runs correctly on the domestic parallel system, and under the methods of optimum, IPoIB's network bandwidth performance is nearly 6x higher than the not-tuned version. IPoIB has more advantages compared with 10 GbE, and the reordering method shows obvious effects.