Intumescent transparent fire retardant coatings had become an importantmeans of fire protection for cultural relics and ancient buildings due to their good decorativeand flame retardant properties，but the aging failure in the service process limited its industrialapplication. In order to evaluate the aging resistance of transparent fire retardant coatingsscientifically，firstly，factor set and comment set were established according to the resultsobtained in the artificial accelerated aging test，and the single factor evaluation matrix was determined. Secondly，the weight relationship of each index was obtained by the hierarchical analysis method，and the formula of coating aging index was constructed to calculate the coating aging index of each object. Finally，the rationality and validity of the fuzzy comprehensive evaluation and the formula of coating aging index were verified by the macroscopic properties of the aged coating. The results showed that the four kinds of transparent fire retardant coatings of the fuzzy comprehensive evaluation value and coatingaging index were consistent with the deterioration degree of their macro properties.