Abstract: To satisfy the throughput and latency requirement of high-performance-computing interconnect network, a low-latency optical-electrical hybrid switching network structure based on arrayed waveguide grating router (AWGR) is proposed. On the basis of "Tianhe-Ⅱ" supercomputer's network topology, part of electrical high-radix routers are replaced by non-blocking and contention-free AWGRs. The optical port of electrical router is re-designed to interface the optical packets with router's internal switching logics. To evaluate the performance of proposed network, a simulation model is developed using OMNeT++ software framework. The simulation shows that the data latency of hybrid switching network is 8%~10% lower than the electrical switching network.