In order to improve the total performance of the rotor oil pump for engines, a MDO (multidisciplinary optimization) model was established based on objective function, such as pumping ability, mass and shock resistance performance of rotor oil pump, and with considering the coupled effect of each subject. A rotor oil pump was designed by using the MDO model based on self-adaptive chaotic optimization algorithm. The result shows that the pumping ability is improved by 2.43%, the pump mass is reduced by 10.0%, the shock resistance performance is improved by 16.3%, the total performance is improve...