Current transitional electricity pricing mechanism was no longer adapted to the new situation of hydropower development, and a variety of electricity price forms based on classified electricity price would become the trend of reform. This paper develops a new system, namely a comprehensive evaluation system of hydropower station electrical energy value, that is based upon an idea of taking storage factor as price-fixing basis. This system assesses electrical energy value that determines electricity price level using the criteria of geographic location, construction investment, operation cost, overall performance, dispatch management, etc. It adopts an A-En binary weight method that combines the subjective and objective characteristics of weight assigning to reflect decision making of evaluation flexibly and fully, and adopts the Topsis method for evaluation. Results show that the new evaluation system and A-En binary weight method are feasible and effective.