In allusion to insufficient use of objective data and unreasonable weight assignment in present comprehensive decision-making of power network planning schemes, based on the combination of the improved TOPSIS method with Delphi-entropy weight comprehensive weight calculation method, a comprehensive decision-making method for power network planning schemes is proposed. Firstly, according to the development features and basic attributions of power network planning, a SECA power network planning comprehensive evaluation index system which is based on safety, effectiveness, cost and adaptability is established. Secondly, the Delphi-entropy weight comprehensive weight calculation method based on the game theory model. Then based on absolute ideal points theory and close-degree projection, TOPSIS method is improved. A combinational evaluation method based on improved TOPSIS-Delphi-entropy weight is used to evaluate power network planning schemes. The validity of the proposed method is verified by calculation results of actual case. The method based on the combination of TOPSIS method with the comprehensive weight calculation method can make full use of objective data. It has the advantages of simplicity, practicality and maneuverability, and the weight of this method is reasonable. This work is supported by Science and Technology of State Grid Hubei Electric Power Company (No. 521538130212).