In order to meet the ERP (Enterprise Resource Planning) system of BOM (Bill of Material) data of all kinds of business needs, studying the internal BOM data, product data information is required in accordance with the requirements of the data format of ERP system. Based on the analysis and comparison of different definitions of materials list of design, manufacture, assembly process, combined with the enterprise BOM status, from the characteristics of data, business process design, construction and maintenance of BOM and other aspects were summarized in detail. Based on PDM (Product Data Management) system assembly BOM data analysis, the demand model of ERP system for the assembly BOM data is built.