Due to the interaction among indices of the environmental of the electric energy substitute technology evaluation index system, the environmental benefits evaluation method of electric energy substitute technology is proposed based on a new perturbation, a group decision-making and fuzzy comprehensive evaluation. Firstly, with respect to the problem of consistency of the judgment matrix is not satisfied, which would cause the evaluation process become complicated and serious deficiencies of decision makers, the disturbance term is set, and the matrix elements are adjusted dynamically according to the disturbance term; Secondly, aiming at giving equal weights to the decision of makers, the weights of the experts are adjusted dynamically according to a proximity weight and similarity weight of the individual until the stable individual weights are obtained; Thirdly individual ranking vectors are obtained by the hierarchical clustering method; Fourthly, considering the individual ranking vector and individual weight, the obtained weights of all the experts under the same index are weighted to get the final weight. At last, the application of fuzzy comprehensive evaluation on the environmental benefits of electric energy substitute technology is evaluated, and also the scientific and feasibility of the model are verified.