Abstract It is likely to improve by far the performance of security and reliability the networks since spatio— temporal chaos model with the high sensibility of the initial value and boundary conditions has more numbers and space of encrypted keys than time—chaos mode1．We simulate the whole communication process between server and client each other by adopting the means of first—-compression—-later—-eneryption on the basis of the analysis of the spatiotemporal chaos model based on coupled map lattices and its complexity．The experimental results show that spatiotemporal chaos theory will be applied widely in the field of secure communication in the near fu— ture． experimental results show that spatiotemporal chaos theory will be applied widely in the field of secure communication in the near fu— ture．