Abstract: The method of multi-chaos time division synchronization is proposed and the theory bases of many single chaotic synchronized systems making up of one multi-chaos synchronized system are attested by which it is achieved that the drivers and responses of many chaotic systems form one multi-chaos synchronized system with one synchronized channel between them used by their discrete synchronized signals in time divisional method. Then, based on the unifying chaotic systems, three chaotic time division usage systems are simulated. Finally, this paper summarizes the condition of multi-chaos time division synchronization and its application in secure communication.