After implementing Enterprise Resources Planning (ERP), we observe machine industry want to improve their storage management capabilities. Thereby Automated Storage and Retrieval System (AS/RS) is considered by some companies. However, there are few previous papers to discuss how to integrate these two heterogeneous systems effectively. So this study tries to use case study method to explore possible problems about the information system integration. The results are showed as follows: (1) ERP software vendors may be more suitable to play the role of information integration than the self-developed ERP companies or AS/RS vendors, (2) The method that ERP software uses a batch carry-over AR/RS system may let the operating procedures more smoothly, (3) The integration of ERP and AS/RS can achieve better operational efficiency.