Abstract: Comprehensive safety assessment of hydraulic steel gates plays an important role in scientific management of a hydropower station, and could provide scientific evidence for maintenance decision. Based on the current technical codes for safety inspection of hydraulic steel gate, the influencing factors of gate safety were classified and stratified,and 7 first-level influencing factors and several second-level influencing factors was chosen as evaluation indexes.These factors were given different weights according to their importance, the judgment matrix was constructed by using three-scale method, and a multi-level fuzzy comprehensive evaluation model was established. The calculation results of a radial gate show that it is simple, efficient and practical to use the three-scale method to compare the influence degree of each pair of factors at the same level and determine the weight. The evaluation results of the comprehensive evaluation model are reasonable and agree with the requirements of the technical codes, which can be used for reference in engineering practice.