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To improve the efficiency of mechanical hydraulic equipment design, reduce the production cost, to build the whole life cycle management platform, to build a mathematical model of mechanical hydraulic equipment. Normal used hydraulic mechanical device is mostly linear time-invariant high-order system. The time domain analysis methods have many limitations in the process of modeling. This paper uses the frequency reponse analysis method, to do research on a certain hydraulic mechanical device control loop, using frequency reponse analyzer, which is targeted to get the model of the hydraulic mechanical device and obtain the model accuracy. By comparing the frequency domain identification model with physical test, the accuracy of the model is verified and the effectiveness of the frequency domain modeling is proved, which provides a foundation for the subsequent full digital simulation and hardware-in-the loop simulation of the aero-engine control system