Abstract: In order to strengthen the capability of safety expression for RBAC with spatial character, the secure spatial DBMS-SECVISTA was taken as platform to research spatial character of the Spatial Rolcl3ased Access Control (SRBAC) model. First, the region coverage constraint of spatial object, duration constraint of spatial object, various spatial object separation of duty constraints and spatial object cardinality constraint of role activation were researched;after extending the traditional session, a non-blocked sessions set was confirmed at any spatial location, then the role hierarchy was discussed in spatial environment. So the theory of secure system.DBMS was optimized and afforded to build the stricter

Key words: Information security, Access control, Spatial DBMS, SecVista