Virtual interface architecture (VIA) established a communication model with low latency and high bandwidth, and defined the standard of user-level high-performance communication specification in cluster system. In this paper, the current development, the principle and implementations of VIA are analyzed, and a user-level high-performance communication software MyVIA based on Myrinet is presented, which is comfortable with VIA specification. First, the design principle and the framework of MyVIA are described, and then the optimized technologies for MyVIA are proposed, which include UTLB, continued physical memory and varied NIC buffer, the pipelining process based on resource and DMA chain, physical descriptor ring and dynamic cache. The experimental results indicate that the bandwidth of MyVIA for 4KB message is 250MB/s, the lowest one-way latency is 8.46ms, which show that the performance of MyVIA surpasses that of other VIA.