In the implementing of STEP, the application protocol(AP) provides share model for specific domain, but it limits to operate each other.It is difficult to ensure its conformance and augmentability. By reference of AP214, it is concerned with describing an approach of modeling based on STEP/AP. It defines four levels of product information architecture and relationships between them. Emphasis is on the whole process of modeling.By building model on four levels,the granularity of product information becomes thin increasingly. Finally, the model being appropriate to describe by computers can be obtained.More importantly, it demonstrates how to extend a model and ensure conformance. It is flexible, and potentially supports modeling on application domain.%在STEP应用过程中，由于现有应用协议的局限性，使得实现多个应用协议的操作变得困难，一致性得不到保证，也限制了对模型的扩展.本文结合AP214，讨论了一种基于应用协议的建模方法.通过结构化应用领域的产品信息，对产品信息进行分层，提出了产品信息的4层结构.通过建立产品在4层结构上的模型，实现产品信息逐渐细化的过程，最终得到适于计算机表达的产品信息模型.应用此建模方法，用户可以灵活方便地创建产品信息模型，实现对模型的扩展，保证语义一致性.
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