Conventional optimization theory cannot work without the optimal solution. In order to improve this situation, a mathematic model for the design of semi active suspension (SAS) and electric power steering (EPS) integrated control system was established based on satisfactory optimization theory. Then the satisfactory optimization method of SAS and EPS integrated control system was proposed. On this basis, SAS and EPS integrated control system and real vehicle road test system were designed. Real vehicle road test was conducted based on the simulation and then the effect on the dynamic performance of car was analyzed. The results show that the theoretical research is consistent with the test results. The peak value and the standard deviation of the front suspension deflection are reduced by 14.00% and 14.56%, respectively, meaning that the impact of suspension on the car body become smaller. The peak of tire displacement is reduced by 1134% so that the tire ground performance is increased. The peaks of the suspension yaw acceleration and the roll angle are decreased by 13.60% and 14.41%, respectively. And their standard deviations are decreased by 15.80% and 16.08%, respectively, which means that the car`s handling stability is greatly enhanced.