Abstract: Aim To study the acceptability and the uniformity of judgement matrix, in analytic hierarchy process (AHP). Methods The concept on judging uniformity matrix was given and using the performance characteristic average of judgement to improve matrix, the sensitivity of analytic hierarchy process was discussed. The academic conclusion was strictly proved and statistical simulation was done in general case. Results and Conclusion Judging uniformity opens up a new way for accepting reasonably a judgement matrix. The method to improve judgement matrix using the performance characteristic average of judgement is effective, it has an important influence on using AHP.