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A control approach based on combining four-wheel steering and differential braking to improve vehicle yaw dynamics has been proposed. A fuzzy logic controller with two inputs and two outputs was designed considering the effects of four-wheel-steering and differential braking on yaw dynamics. The adequate yaw moment and rear wheel steering angles generated by the fuzzy logic controller made vehicle's actual yaw rate and sideslipped angle track their desired values. The vehicle model for simulation was established in Matlab/Simulink software environment. The simulations in some typical cases, including J turn and lane change, were carried out and the simulation results showed that compared with the individual control of these two systems, the combined control approach could improve vehicle handling and stability performance significantly, thus, the active safety of vehicle has been enhanced.