Abstract: This paper first analyzed the collaborative characteristics of cgovernment, described the security problem e-government system facing in the environment of multi-domain collaborative work. ho draw on the experience of role based access control thought, we advanced the access control model of e-government based on the distribution of user,role and authority, through introducing the concept of authority period and effect scope, we established the distribution mechanism of role and authority, described the operating mechanism of model, and gave the thought of algorithm realizalion for conciliation problem in the situation of occurring access violation. Finally we gave a typical administrative activitics-documents circulation countersigning for example, concretely specified the application method of model, effectively solved the problem of system security and information confidentiality for e-- government in the multi-domain environ- mcnt.

Key words: F-government, Collaboration, Role, Authority, Access violation