Based on STEP standard and IDEF method,function model of product model information and its structureswith three layers (i. e. function layer,generic part layer,generic structure layer) are built.

• 基于STEP标准和IDEF产品建模方法，提出了基于功能层的产品信息建模和产品信息模型的三层结构：功能层、零部件层和构造层。