Abstract: Accuracy of the indicator weight is one of the keys to the assessment problem and the subjective and objective weighting methods have their own drawbacks. Thus， a group decision-making weighting method based on double base point analysis is proposed. The subjective weights of experts are collected by AHP. Taking the subjective weighted average as the initial positive and negative basis， the weight sequence is normalized relative to the positive base. The minimum Euclidean distance is constructed to solve the expert credibility and correct the subjective weights. The revised weight is repeated as a positive basis point until the result converges to the optimal weight. A case study verifies that the iteration of weight weakens the influence of over-ambiguous weight on the final weighting result. The process of merging credibility and subjective weight takes into account the respective advantages of the subjective and objective weighting methods， and it improves the scientificity of the empowerment results.

Key words: double base point analysis, index weight, group decision making, level analysis, bridge engineering