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In this paper,a novel chaotic circuit is constructed and a new chaotic system is proposed based on the novel circuit for the first time.Some simulations are presented to verify its chaotic characteristics by Multisim.Then the novel chaotic circuit is applied to construct a fourth-order chaotic circuit.Simulation results verify the existence of the new fourth-order chaotic system.Moreover,a new chaotic secure communication circuit is proposed based on the novel fourth-order circuit.To illustrate the effectiveness of the proposed scheme,the intensity limit and stability of the transmitted signal,the characteristic of broadband,and the requirements for accuracy of electronic components are presented by Multisim simulation.Lastly,the proposed chaotic circuit is implemented through analog electronic circuit,which is characterized by its high accuracy and good robustness.The analog circuit implementation results match the simulation results.In addition,the proposed circuit design methods can also be used in other chaotic systems.