Based on the establishment of evaluation index used in CBT aircraft maintenance system, the conversion of qualitative index to quantitative index is realized by using Fuzzy AHP synthesize evaluation method. The evaluation analytical model of aircraft maintenance system is built up to overcome the subjectivity and randomness of evaluation and to realize the scientifi c evaluation for the aircraft maintenance system. The CBT evaluation system is designed to solve the problem that there are a great deal of artifi cial mathematics in the evaluation process. The experiment shows that this kind of evaluation system can solve the evaluation problem of CBT aircraft maintenance system.