In order to assess the operation state of electric energy meter timely and precisely,an evaluation method of electric energy meter operation state based on set pair analysis and evidence theory is proposed.Firstly,in line with the basis of the electric energy meter itself,on-line monitoring and on-site detection information,the evaluation index system of the running state of the electric energy meter is established.Then the fuzzy analytic hierarchy process and entropy weight method are applied to confirm the subjective and objective weights of each index,and then the game theory and variable weight theory are applied to confirm the combined weight and variable weight of the index.Then,the set pair analysis method is applied to confirm the connection degree between each index and each state level,and the evidence theory is applied to synthesize the degree of connection of each index to obtain the evaluation results.Finally,the maximum membership principle and the reliability criterion are used to evaluate the running state of the electric energy meter.The analysis results of the example show that the method is consistent with the actual operation of the electric energy meter,and the evaluation results are accurate and intuitive.Compared with the fuzzy comprehensive evaluation method and the set pair analysis method,the method reaches 0.5256 in the state level discrimination,which is significantly higher than 0.3024 of the fuzzy comprehensive evaluation method and 0.1483 of the set pair analysis method.It has a good discrimination and provides a new idea for the state evaluation of the electric energy meter.