| Chaos is a seeming random phenomenon, and it is a unique movement form in nonlinear dynamic systems. It exists widely in nature. Today, chaos has been the scientific foreland. Recently, chaos control and chaos synchronization are research hotspots, and they are applied widely in many fields including secure communication, artificial intelligence and so on. However, most research on chaos synchronization is just done in theory, without designing the synchronous circuit of multi-chaos systems. Therefore, there is a gap between the chaotic theory and practical application. In this paper, we design practical control circuit, analyze and solve the problem by simulation, enhance the relation between chaotic theory and practical application.In the paper, we investigate the synchronous problem of two and more Lorenz chaotic systems. First, we analyze the dynamic characteristic and circuit structure of Lorenz chaotic system, construct the corresponding circuit and simulate with Matlab and Multisim 2001, and we can get the Lorenz graph in the oscilloscope. Then, some kinds of methods of chaos synchronization are studied. We design the circuit of synchronous controller of single variable. And the best method of achieving the synchronization of two Lorenz chaotic systems can be got by comparison. Finally, we design the control circuit of the multi-Lorenz chaotic systems according to the correlative theory. And we simulate the circuit with Multisim 2001. Experimental result shows that the states of multi-Lorenz chaotic systems are absolutely synchronous.
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