Abstract:In order to improve the current degradation of service attacks to reduce TCP's service quality, a RoQ attack recognition method is presented by quantum oscillator algorithm.In this method, the quantum harmonic oscillator is set as the carrier, and is calculated the transition from highenergy state to the base state of quantum oscillator.So, the abnormal network traffic and the change of packet loss aremonitored and counted, and the degraded attack is identified.The experiment results show that, this method caneffect depict the factors, such as missed inspectionrate and loss rate, and accurately identify the degraded attack.