This paper discusses a kind of static voltage multi-index comprehensive evaluation method. The method is based on node voltage changes, voltage active/reactive power margin three voltage sensitivity index, fully considers the different factors influencing voltage stability, and combines with the subjective assignment to the objective value assignment method of each index respectively and gives different weights to calculate comprehensive index. Finally, a real power grid of Hunan southwest is simulated and analyzed, of which single index and integrated index are used respectively to identify system weak buses, verifying the proposed identification method is comprehensive, effective and scientific. This work is supported by Science and Technology Program of Hunan Province (No. 2016TP1023), Postgraduate Scientific Research Innovation Program of Hunan Province (No. CX2015B602), Mass Innovation Program of State Grid Hunan Province Electric Power Company (No. 5216E015000L), and Talents Cultivation Demonstration Base Construction Project of Hunan Enterprise and Universities Cooperation (No. [2015]274).