Abstract: In this paper，a hyperchaotic system is proposed.The system is constructed by introducing an additional state variable into the third-order Lorenz system.Some basic properties are analyzed in detail，and the Lyapunov spectrum of this system is gained through computation，so the existence of hyperchao is verified.Moreover，an analysis electronic circuit is designed，and various hyperchaotic attractors of this system are observed from the circuit experiments.

摘要： 文中介绍了一个超混沌系统，该系统是在一个三阶Lorenz系统的基础上引入一个外加状态变量而构成。对该系统的一些基本特性进行分析，并通过计算得到了该系统的Lyapunov指数谱，从而验证系统超混沌的存在性。还设计了一个模拟电子电路，从电路实验中观察到了各种超混沌吸引子。