In view of the insufficient of studies in evaluation of aviation equipment maintenance capability, this paper puts forward an aviation equipment maintenance capability evaluation method based on entropy weight. According to the work of aviation equipment maintenance, this paper divides it into three sections, including preparation section, repairing section and maintenance section. This paper analyzes the feature of every section, and builds an index system. The weight of each index is determined by entropy weight method. The index system according to work flow gives better expression to the integrality and continuity of aviation equipment maintenance. The model is used to evaluate the maintenance capability of a base. The result shows that index system proposed in this paper can provide reasonable and effective conclusion, and theoretical accordance to aviation equipment maintenance capability.