Abstract: The 3 major application systems,electronic commerce system,electronic administration system, management and decision-making system,established in tobacco industry were developed separately and independent of each other,which increase the maintenance cost and complexity of system running and management. From the points of practical demands on information system in tobacco industry, the necessity and feasibility for sharing the resources among the said systems were analyzed,and the problem of how to connect with CA system was discussed. An integrated plan including unified identity management,unified certification, and single sign-on was proposed.