Abstract: Based on theories of automaton in the compiler principle，this paper presented the designing and programming algorithms of the interface of heterogeneous data source for urban road simulation model.Data exchange was through files.As an example of DXF source file，it established an automaton of the line entity，traced red information through state transition graph.At the same time，it also gave the class diagrams in UML（Unified Modeling Language） of static simulation models when they regenerated in target environment.The results indicate that automaton creates a new idea and method for traffic system modeling and makes urban foundational data source sharable and reusable.

Key words: traffic system simulation, urban road simulation model, interface of heterogeneous data source, automaton

摘要： 根据编译原理中的自动机理论，给出了异构数据源城市道路仿真模型的接口设计及接口实现算法，数据交换采用中性文件交换方式。以DXF格式源文件为例，建立图形实体自动机模型，通过状态转换图跟踪读取信息的轨迹；并给出了城市道路仿真模型在目标平台上重生成时的UML类图。结果表明，自动机理论为交通系统仿真建模提供了一条新的思路和方法，同时使异构数据源城市道路仿真模型接口实现具有一定的理论依据，有利于城市道路基础数据源的共享和重用。

关键词: 交通系统仿真, 城市道路仿真模型, 异构数据源接口, 自动机理论