By analyzing the disadvantage of current GPS monitoring system, this paper proposes a design scheme of a multi,mode service GPS monitoring system. The principle of the monitoring system and its components are introduced. The design method of Automatic Vehicle Location (AVL), network architecture of monitoring system and multi,mode service interface are described in detail, which solves the compatibility between multi Automatic Vehicle Location, communication modes and oiher GPS systems. In practical application, it shows that the characters such as stability and easily extended can meet vast demand.%通过分析现有GPS交通监控系统存在的主要问题,提出了一种多服务模式的GPS监控系统设计方案；介绍了系统的组成及工作原理,详细给出了系统中车载终端、系统网络架构模式和多模式系统接口设计方法,解决了 GPS监控中多种车载终端、多种通讯方式以及和第三方GPS接口的兼容性问题；广州ITS项目实际应用表明,该系统具有性能稳定,扩展性强等特点,能满足大多数应用场合的需要.
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