According to the characteristics of rotary direct drive electro-hydraulic pressure servo valve, the lumped parameter modeling and three-dimensional (3D) field analysis methods are integrated. The lumped parameter method is used for mathematical modeling for system parts with clear physical concept, and for complicate structures difficult to simply and derive, the 3D mathematical model is employed to analyze the magnetic field, flow field and structural field. Moreover, numerical fitting is carried out to the field analysis results, and the model recognition methods, such as neural network, are used for modeling. Specific mathematical algorithms are used to represent the mathematical relationship between the input parameters (such as structural parameters and environmental parameters) and the feature output parameters. Finally, the algorithm which can be used to evaluate the relationship between the input parameters (such as structural parameters and environmental parameters) of the analyzed object and its static and dynamic performances is obtained. For similar research objects, the user only needs to change the values of input parameters to complete the analysis and evaluation of the static and dynamic performances of system.