A level inference method for aggregated information of objects based on associated attributes is put forward in order to give a solution to information leakage caused by the association among objects.According to dependency relationships

highly associated objects are found

and then the probability of higher level information inferred by aggregation of associated objects is computed by probability estimates of fuzzy sets on secure level of attribute.The method may contribute to establish access control policy in multi-level secure network

and control restricted access of associated objects in order to reduce the risk on information system.