In order to improve the objectivity and accuracy of infrared anti-jamming evaluation, aiming at the problem that the subjective factors of discriminant matrix are too strong in the process of evaluating infrared anti-jamming ability by analytic hierarchy process （AHP）, an infrared anti-jamming evaluation method based on principal component-analytic hierarchy process was proposed. Firstly, the correlation coefficient matrix between indexes was solved by principal component analysis （PCA）, and the index of average influence degree was put forward. Then, through this index value, the discriminant matrix was adjusted according to the established adjustment rules. Finally, using the infrared anti-jamming simulation data, combined with the adjusted discriminant matrix for AHP, the principal component-analytic hierarchy process infrared anti-jamming evaluation model was established. The simulation results show that the model can better evaluate the evaluation results of infrared countermeasure in the corresponding jamming environment, there is a negative correlation between the confrontation result and the evaluation score. The score is bounded by the E=1.0, and the evaluation results of missile hit are all above the average. The evaluation result of infrared anti-jamming under this countermeasure condition can be observed intuitively.