The inner and outer oil film distribution pressure and resultant force of elastic ring squeeze film dampers(ERSFD) were calculated through the generalized Reynolds equation with the effect of fluid inertia by finite difference method

and used to analyze the dynamic of ERSFD-rotor system. Comparing oil film pressure

oil film resulant force and the rotor amplitude-frequency of the rotor systems with/without fluid inertia

it was found that when the Reynolds number was large

there was significant difference between them. The equivalent stiffness and damping were larger

the critical speed was bigger and the amplitude was smaller in the resonance zone when the fluid inertia was calculated. When the rotor speed is bigger or the viscosity is smaller and the Reynolds number is larger

it is necessary to consider the effect of fluid inertia in calculation of oil film force.