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采用面向对象方法，对万工显上位机软件包进行分析，得到了面向对象的分析模型。通过面向对象的设计，得到了上位机软件包实现模型。通过引入消息驱动机制及滞后联编，有效地控制了软件包的规模及其复杂性。
Using the object-oriented method, we analyzed the software package of PC-HMI and got the object-oriented analysis model. Through the object-oriented design, we get the software package implementation model of PC. The introduction of message-driven mechanism and lag binding effectively control the size of the software package and its complexity.