The management of information resource has become the key point to the large complicated system with the development of information technologies. Problems of storing pressure and reading efficiency became more serious because of data explotation and large scale of redundant data. A novel redundant data deleting algorithm based on the cloud storage plalform was proposed in this paper to deal with the problem of mess data store. Space division and role division techonlogy was used to insure the security of data sharing in the system. A novel educational administration information system was used to validate the feasibility and effectiveness of the algothrisms proposed in this paper.