According to the the characteristic of tower structure and manufacturing property, the tower components are divided into the purchased (CP), the cooperative (CS), the inherit (CL), the key (CK) and so on. In order to ensure the product data integrity, consistency and correctness in chemical tower, different processing rules are adopted to CP, CS, CL, CKin mapping from EBOM(Engineering BOM) to PBOM(Proeess planning BOM). Based on EBOM view in UG, the mapping function from EBOM to PBOM is established to process all BOM data. PBOM view is created accordingly, to achieve computer aided design on BOM in the data management for chemical tower.