The traditional Analytic Hierarchy Process (AHP) is always adopting 1~9 criterion quantitativeability to judge matrix. By so doing, the criterion is poor in consistency, and strong in manmade subjective. This paper proposes an index scale to improve AHP, and establishes a fuzzy comprehensive evaluation model to evaluate the jamming effectiveness on radar seeker. The paper builds up an evaluation index system suitable to the radar seeker according to the work principle and function features. The membership function is defined with fuzzy comprehensive evaluation, and the weight vector is fixed with AHP of index system. Finally, noise jamming is chosen as an example to verity the effectiveness of the model. The results show that the consistency ratio of fuzzy Analytic Hierarchy Process with index scale is zero, thus reducing the influence of subjective factor and increasing veracity and reliability of effectiveness evaluation.