The method of secure communication based on Spatiotemporal chaotic sequence is proposed, a method using spatiotemporal chaotic model to create spread - spectrum sequence is presented, and the problem of choosing a driving system synchronous sequence is discussed. Based on the above, a model of CDMA communication system is given. The result illustrates that the system possesses high security and stronger synchronizing ability and is easy to realize. In addition, by using only one or two discrete - line synchronizing chaotic sequences the system can be driven to work in multi-channel communications, thus the communication efficiency is enhanced significantly.