The application of the complex network theory to the power grid is introduced,and the method and importance of using the theory to analyze blackouts are illuminated,as well as how to analyze the dynamic charac- teristics of power grids based on the theory.

But recently,successive power blackouts of large scale occurred in the world,result in a great loss,which attracts researchers attention to the reliability of power grid.

This case-based reasoning(CBR)system for power system restoration has a hierarchical structure.

This paper analyzes the large area blackout accident in the Qilu company on November 18th and offers the prevention measures in order to lessen such these accidents.