In this article, the flow equations of capillary, membrane Restrictors, and spool are used to study the static and dynamic characteristics of static and dynamic mixed pressure neck bearings and the stability of the supported Jeffcott rotor-bearing system. The Reynolds equation is established by the perturbation method to simulate the bearing oil film, and the throttle parameters, the number of oil cavities and other related parameters are set, and then the finite difference method is used to solve it iteratively. The static and dynamic characteristics of the bearing are obtained to discuss the damping coefficient, stiffness coefficient and inertia The influence of force threshold and critical swirl ratio on the static and dynamic characteristics and stability of the system.