The condition assessment of transformer is a systematic process, the appropriate method can evaluate the running status more accurately. Considering the characteristics of the transformer, a method of transformer condition evaluation based on fuzzy analytic hierarchy process is proposed. This method overcomes the defects of subjective factors when using fuzzy analytic hierarchy process, determines the fuzzy judgment matrix by historical statistics data and calculates weight by fuzzy analytic hierarchy process. After collecting the data of the field condition, it calculates the weighted sum of each layer, and finally determines the overall health status of the transformer. The method considers both the field measured data and historical statistics, the calculation result is accurate and the process is clear. The results calculated by the actual data shows that the method can accurately assess the health state of transformer and if the transformer is in abnormal condition, then the specific causes can be determined by analyzing the score of each fault type. This method shows broad application prospects in state evaluation of transformer. This work is supported by Natural Science Foundation of Anhui Province (No. 1408085ME100).