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如何将ＳＴＥＰ的方法和规范应用于系统开发是解决计算机集成制造系统（ＣＩＭＳ）开发的关键问题之一。集成化ＣＡＤ／ＣＡＭ系统是ＣＩＭＳ的核心．实现将ＣＡＤ的工程设计功能和ＣＡＭ的制造功能的结合。本文讨论通过ＳＩＥＰ的标准数据接口ＳＤＡＩ实现系统集成的集成方法，采用ＳＴＥＰ的数据交换、建模思想，实现了一个产品模型为核心的ＣＡＤ、ＣＡＭ集成系统一ＧＨＣＡＤ（高华ＣＡＤ）。
How to apply the method and specification of STEP to system development is one of the key problems in the development of CIMS. Integrated CAD / CAM system is the core of CIMS. To achieve the CAD engineering design capabilities and CAM manufacturing capabilities. This article discusses the integrated method of system integration through SDAI, the standard data interface of SIEP. It adopts STEP’s data exchange and modeling idea to implement a product model-centered CAD / CAM integrated system-GHCAD.