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Seven degrees of freedom active control model was set up for suspension system, the optimal controller was designed, and the optimal control rate of the stochastic state feedback regulator was obtained by using the separation theorem. The slide mode controller (SMC) which could track the target yaw rate was designed after setting up the mode of the active front steering system. In order to improve the vehicle ride comfort on steering condition, one upper coordinated controller was designed. Based on the vehicle sensors, the upper coordinated controller has been real-timely inputted into the steering and suspension system different tracking targets and controls parameters. The simulation results showed that the controllers could preferably improve the ride comfort and the maneuver stabilization of the vehicle.