The popularization and application of management information system (MIS) is an important mark of the information age, which mainly includes two subsystems: search system and system of analysis and utilization. Taking Haier Group for example, the thesis analyses its construction experience in building MIS and information competition rules that it contains. Haier's experience has fully proved that MIS' integration is not only a platform for integration of subsystems, but also the data integration that subsystem could achieve timely management, play and explore the overall effectiveness of information system.