In this paper, a brake-by-wire system named Electronic Hydraulic Brake (EHB) System has been detail designed, which is capable of faithful reflection of driver's braking intention. Simulation experiments were performed in the designed system, which showed that the proposed system can established for smooth control of wheel cylinder hydraulic pressure. With this new brake system installed in the hybrid passenger car, the vehicle stability has been improved by controlling the braking torque of four wheel cylinders individually and smoothly.