本文通过介绍OPC 技术的工作原理,结合OPC 客户端的工作机制,给出OPC 客户端的开发方法及在的Delphi 的具体实现,提出了OPC 客户端开发工具的设计方案,并实现了OPC 客户端开发工具的接口函数,可以使OPC 客户端开发者可以轻松的开发OPC 客户程序。 关键词: OPC、OPC 客户端、开发工具、COM 组件 Abstract: This article provides the way of exploring OPC data access server and its fulfillment in Delphi via the introduction of the working principles of OPC technology combined with the working mechanism of OPC data access server. In addition, it sets forth its designing scheme and the interface functions of OPC toolkit at the same time in order to facilitate the developers of OPC data access server. Key Words: OPC、OPC Client、Develop Toolkit Component object Model