This paper introduces the research of network communication on the lab environment of virtual reality. The standard DIS protocol is adopted. The structure of PDU transmitted object data is defined.

论文阐述了对虚拟现实实验环境中网络通信的研究，采用了标准的DIS协议，定义了实体数据的PDU结构，并在通信层应用组播方法，对提高网络传输的性能作了分析。

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To summarize the existing research of the soft budget constraint, we can find that most of them use the dis-cooperate game theory to analyze, and mostly concentrate on the government and enterprise.

已有的关于软预算约束的研究大多集中在政企之间，且多以非合作博弈方法对之进行分析。

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Distributed interactive simulation is a new technology of simulation. The research on dis-tributed interactive simulation environment is of great importance both in theory and application.

分布交互仿真是一种新兴的仿真技术，分布交互仿真环境的研究具有重要的理论意义和实用价值。

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