Spring energized seal ring is a kind of sealing device with excellent performance,its energy storage spring can provide initial sealing pressure for the sealing ring and play a role of auxiliary sealing.At present,most of the research on spring spring energized seal is to establish a two-dimensional axisymmetric model in finite element software for simulation experiments,but there are still insufficient understanding of the mechanical characteristics and modeling and calculation methods of energy storage spring.To achieve parameterized simulation design of spring energized seal rings with different structures,the space curve parameter equation of the annular energy storage spring was deduced,the three-dimensional finite element model of the double-layer helical energized spring was established,and its mechanical properties were simulated and analyzed.The inner and outer stiffness of the energized spring was defined,the influence of different structural parameters of the spring on its stiffness was studied.The results indicate that the thickness of the spring and the outer diameter of the spring section have a significant impact on stiffness,while the influence of the spring pitch diameter and turns on stiffness can be ignored.The principle of establishing the axisymmetric equivalent model was proposed,and the empirical formula of the axisymmetric equivalent model was established,which provides a reference for the parametric simulation design of the spring energized seal.