A new protection model with key implementing techniques and characteristics for the database is presented based on demands on the on-line verification of relay setting and quantitative comparison simulation. The following requirements for the protection model design are addressed: proposing a universal protection model; reducing the difficulty in database maintenance; decreasing the capacity of the whole database; enhancing data access efficiency. An integrated power system model has been developed， including the primary devices model and the secondary devices model. In view of the unified power system model， graphical database development oriented to the actual complete protection devices and graphical correlation between the protection devices and the corresponding primary equipment are implemented. Application shows that the protection modeling method is rationally designed and has broad prospects for application.