分析了基于耦合映象格子时空混沌系统的同步问题 ,首次发现了耦合映象格子中存在的有偏反相同步现象 ,并利用单向耦合单峰格子进行了讨论。研究结果表明 ,在系统参数满足一定条件下 ,耦合映象格子在实现同相同步的同时 ,还可实现有偏反相同步。这一结论可应用于混沌键控系统 ,并能增强系统的保密性 The synchronization problem based on coupled map lattice spatiotemporal chaos system is analyzed. It is found for the first time that there is a biased anti-phase synchronization phenomenon in the coupled map lattice, and the unidirectional coupled unimodal lattice is discussed. The results show that under the condition that the system parameters satisfy certain conditions, the coupled map lattices can achieve the same phase reversal simultaneously. This conclusion can be applied to chaotic keying system, and can enhance the system’s confidentiality