Abstract: To deal with the potential threat to the security and stability of power grid caused by high proportion of grid-connected new energy, a comprehensive evaluation method was utilized to realize the security evaluation and the identification of weak power grid to provide a more comprehensive reference information for the decision of system secure operation. Firstly, a security evaluation index system for the power grid containing new energy was established. Secondly, the decision-making trial and evaluation laboratory (abbr. DEMATEL) method and the anti-entropy weight (abbr. AEW) method were used to calculate the subjective and the objective weights of the index. Thirdly, based on the thought of relative entropy the comprehensive weight was calculated. Finally, taking the modified IEEE-118 bus new energy power system with different permeability as a reference, and by use of Više-Kriterijumska Optimizacija I Kompromisno Rešenje (abbr. VIKOR) method the comprehensive evaluation, the ranking analysis on the advantages and disadvantages as well as the verification of sensitivity were conducted. The security ranking of new energy power systems with different permeabilities is as following: 10% >40% >20% >30% >50%, and such an evaluation results can be available for reference and utilized in practical engineering.