Abstract: A new chaotic system is constructed in the Lorenz system family. This new chaotic system is then subjected to a theoretical analysis by means of an analysis method of nonlinear dynamical system. Since the analog circuit is characterized by a high initial state of randomness, analog circuit is used to verify the new chaotic system and in the course of circuit design, modular thinking applied. Meanwhile, the electromagnetic properties of the new chaotic circuit are simulated by EWB software.