This paper presents a high-bandwidth flight control design for helicopters using an integrated rotor control system. Based on an explicit model-following control design, a rotor state feedback control law was developed and integrated into the baseline control system. The rotor/body feedback gains were comprehensively optimized to improve the stability of helicopter and a rotor control augmentation was designed to enhance command tracking ability, based on which a design method of command model parameters was proposed to improve helicopter attitude response bandwidth and attitude quickness. Finally, by a high-order helicopter flight dynamics model, the helicopter handling qualities were analyzed. The results show that the integrated rotor control system can maintain the stability margin of the baseline control system while improving the control frequencies. The roll and pitch control bandwidths are improved by 10% and 18% respectively, while the roll and pitch attitude quickness are improved by 20% and 25% respectively.