中文摘要：

研究了在2个Lorenz系统中实现混沌同步的2种方法：驱动-响应同步法和李雅谱诺夫直接法．数值计算与模拟表明，经过弛豫过程后，这2种方法都能实现2个Lorenz系统的混沌同步，并且能够取得良好的同步效果．但是李雅谱诺夫直接法必须在给出系统的动力学方程和李雅谱诺夫函数的前提下使用，相比而言驱动-响应同步法更容易实现混沌同步．

英文摘要：

Two methods are studied to achieve the two chaotic synchronization of Lorenz systems, which are drive-response synchronization and Lyapunov direction method. Numerical simulation shows both methods can make the two Lorenz systems achieve chaotic synchronization after the transitory course. And these synchronous effect are favorable. The system dynamic equation and Lyapunov function must be known in Lyapunov direction method. Comparatively, drive-response synchronization achieves chaotic synchronization more easily.