With the problems of energy consumption, environment pollution, vehicle safety and traffic congestion becoming increasingly urgent, Green Energy and intelligent vehicles have been becoming a hot topic. And higher requirements are needed for automotive chassis dynamics control system. A novel type of brake-by-wire system actuator for new energy vehicles and intelligent vehicles is proposed in this paper. Four inlet valves and four outlet valves are added to the layout of a conventional four-channel hydraulic control unit. A permanent-magnet synchronous motor provides a stabilized high-pressure source in the master cylinder, and the four-channel hydraulic control unit ensure that the pressure in each wheel cylinder can be modulated separately at a high precision. Besides, the functions of Anti-lock Braking System, Traction Control System and Regenerative Braking System, Autonomous Emergency Braking can be integrated in this brake-by-wire system. A sliding mode variable structure vehicle dynamics stability controller is built in MATLAB/Simulink. The Integrated-electro-hydraulic Brake System (I-EHB) actuator model and vehicle dynamic model with 15 degrees of freedom are built in simulation package AMESim through a parameterized and modularized method. Simulations are conducted via co-simulation interface of MATLAB/Simulink and AMESim under scenarios of the typical braking and FMVSS 126 ‘sine stagnation’ regulation. Simulation results show that hydraulic braking forces are coordinated well during typical braking process, verifying the feasibility and effectiveness of the models built and control strategy proposed. Under FMVSS 126 ‘sine stagnation’regulation, compared with the base systems equipped without/with the conventional ESP, the proposed stability control system has a good improvement on the vehicle dynamics.