摘要：Upper-lower computer mode is the main architecture design of the amphibious combat simulation system(ACSS)at *** continuous improvement of real-time performance,software and hardware infrastructure,the exponential growth of operational network data scale is realized,but the availability performance of ACSS *** reliability of the working host as the key node has become the bottleneck of the overall availability of network nodes in the *** optimize the network node architecture of ACSS,this paper presents an effective optimization solution by designing the dual redundancy warm-standby module of the mission computer and I/O port,the algorithm of selecting output path of the mission computer in network nodes,the decision-making algorithm upon the on-duty host and output,and the video output decision-making algorithm upon the upper ***,the complete process of operational data from the input to output and the opposite is implemented well to guarantee the overall availability of network nodes in the *** has great advantages of wide applicability,strong reliability and high real-time switching speed.