Chua's circuit,which is improved to integrate conveniently,is presented. A driveresponse chaotic synchronization system is constructed,which possesses to a certainly stability,resisting-disturbance and so on,by means of research,it can be concluded that the chaotic synchronization system is provided with the characteristic of chaos synchronization self-maintenance,and the research results are also presented. Utilizing the characteristic,the critical problem of how to simultaneously transmit the controlling signal of chaotic synchronization and the secret signal at a channel can be solved. The experiment result provides the foundation of putting chaos into practice application to secret communication.