Abstract: Using centrality indicators to rank the relative importance of nodes and lines in the network is a common method,which can identify key nodes and key lines in the network and conduct vulnerability evaluation. However,because the unique topological structure of the power grid is not considered,deviations will occur when the centrality indicators of the general complex network theory is used to analyze the vulnerability of the power grid.For this reason,this article redefines the centrality indicators to better conduct the vulnerability of the power grid valuation based on electrical parameters. The simulation results show that the centrality indicators based on the redefinition can make the power grid centrality distribution tend to concentrate on the minority key nodes and lines,which helps to identify the vulnerability of the power grid.