Abstract: A scoring method of index is proposed,which can reflect the satisfaction degree between each node and each index when the nodes are merged into different islands during the generation process of the islands.Then the index weight coefficients are introduced,and a comprehensive scoring method considering multiple indices is put forward.Combined with the comprehensive scores of nodes,this paper describes the implementation process of the proposed automatic searching algorithm for controlled islanding surface of power system based on greedy algorithm.The example of Guangdong power grid verifies the validity of the proposed algorithm.Compared with the conventional methods,the process of searching islanding surfaces can be realized automatically without manual intervention.