In light of the “backlash” problem of the mechanical inerter-spring-damper (ISD) suspension, an ISD suspension based on hydraulic inertia was put forward. The structure and working principles of hydraulic inertia were introduced, and the hydraulic ISD suspension of a vehicle model was established. Then, Matlab/Simulink was used to analyze simulations of ride comfort, and the dynamical performances of hydraulic ISD suspension were studied preliminarily when pulse input and random road input were chosen as signals. The simulation and experimental results demonstrate the model′s accuracy and show that the body′s vertical acceleration can be reduced significantly compared with that using passive suspension.