介绍了内燃机车电路仿真系统的构成及功能。将图形技术、面向对象的方法引入建模过程，并着重论述了电路的图形模型和网络模型。系统软件由电路图形编辑、网络接线分析、操作显示、故障模拟等模块组成。通过在Ｗｉｎｄｏｗｓ环境下对东风７型内燃机车电路仿真，表明该软件能够形象地模拟机车电路的工作原理和某些故障现象，易于操作，有较好的培训效果 The composition and function of diesel locomotive circuit simulation system are introduced. The graphic technology and the object-oriented method are introduced into the modeling process, and the graphic model and network model of the circuit are emphatically discussed. System software consists of circuit graphics editor, network connection analysis, operation display, fault simulation and other modules. Through the simulation of Dongfeng 7 diesel locomotive circuit in Windows environment, it shows that the software can vividly simulate the working principle of locomotive circuit and some fault phenomena, easy to operate and have good training effect