“…However, in a feedback control strategies the necessary condition for suppressing the dynamical system is that the feedback coefficient must be positive. Most of the previous work on chaos control was mostly focused on classical dynamical systems under this condition such as the Liu system (Dou, Sun, Duan, & Lü, 2009;Zhu & Chen 2008), L̈ system (Pang & Liu 2011), Unified system (Tao, Yang, Luo, Xiong, & Hu 2005), Lorenz system (Zhu, 2010), Chen system (Yan, 2005), and et al But in works (Aziz, & AL-Azzawi 2015;Zhu, 2010) founded some cases it can't be controlled, although with positive feedback coefficients. This paper answer this equation and it focused on these problems and we suggest a new method which includes four cases: two cases have at least two positive feedback coefficients and other cases have only one positive feedback coefficient.…”