Abstract: Construction of synchronous controller by using the method of error system, synchronization control and its secure communication of the Liu chaotic system was studied. Based on the theory of stability, the stability of the modified Liu chaotic system was analyized. The construction method of error system of synchronous controller drive system and response system was presented. The synchronous control of error system of the drive system and response system was studied numercally, and the problem of security communication was also studied with the controller, the theory analysis and numerical experiment results are samiliar,which verify its correctness and effectiveness.