Nowadays, Role-based Privilege Management has been generally applied in the Management Information System. Using MIS can give different operation interfaces with different identification user logins which thus makes the system easy to use and improves its robustness. On the basis of one provincial project the author helds, several key algorithms around 4 parts are designed, which include privilege-menu processing , data preparation for updating role, web page presentation logic, and client-user complicated login control. Result of practical usage shows that they perform well.