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How to ensure the safe operation of civil aviation engine during flight is the challenge for all civil airlines. Therefore, it becomes more and more important to master the characteristic index of engine’s operation valves, to model and analyze the parameters of engine’s operation valves scientifically and as a result, to monitor engine in real time. Aiming the problem that it is difficult to obtain the operation baseline from engine manufacturer, adopting gene expression programming algorithm (GEP), using the quick access recorder (QAR) data of CFM56-7B engine that is the most mainstream civil engine, this paper mines and analyzes the engine’s variable bleed valves (VBV) operation baseline. The results show that, during VBV nonlinear regression analysis, GEP has the advantages of little deviation and high precision. GEP can also get specific and convenient function relations, which can improve the accuracy of VBV monitoring and fault diagnosis effectively.