This letter gives a method that can achieve chaos synchronization of chaotic systems. This method makes synchronization problems changed into the asymptotic stability questions of the 0 solution of the linear systems, then gives the control variable according to the control theory of linear system. This method is simple and it can achieve chaos synchronization of two chaotic systems efficiently. The synchronization is overall asymptotic stable. The basic theory and the numerical experiments of two identical and nonidentical chaotic systems are performed. The numerical example is a new system.