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The theory of digital communication system encryption through the chaotic oscillator produces the continuous pedigree similar white noise non-periodic signal to cover up, modulate, intermissive noise and annihilate the useful communication signal. This paper analyzes the chaotic results condition of the Duffing oscillator. Firstly, we give the theory of use of the continuous chaotic signal to encrypt the digital communication system, and bring forward the basic methods of chaotic cover up for digital communication system through the Duffing oscillator, at the same time the circuit is also actualized. The theory analyzes and the simulates the results, including the circuit test that confirms the conclusion that the Duffing oscillator encryption digital communication system has a very good secret capability, can be easily realized, and has a reliable performance.