The electromagnetic environment on the modern battlefield is becoming more and more complex, and the anti-jamming capability of radar has become one of the important indicators to measure the performance of the entire radar system and even the electronic countermeasure equipment. Aiming at the problem that the fuzzy comprehensive evaluation method is not sensitive to the membership degree of each index in the evaluation of radar anti-jamming effectiveness, inspired by the "Cannikin Law", based on the reward and punishment mechanism for the membership degree value of each index in the effectiveness evaluation index system, this paper constructs a local state variable weight function performs variable weight on the constant weight vector. On this basis, an improved fuzzy comprehensive evaluation method is proposed. Finally, the evaluation method is applied to the evaluation example of radar anti-jamming performance. The results show that more objective and reasonable evaluation results can be obtained by using this model.