Synchronization of the unified chaotic systems is investigated, where the parameters of drive and response systems are different. An appropriate controller is designed for response system based on the direct design method. The error system is transformed into a stable system with special tridiagonal structure. The states of error system with the special tridiagonal structure are asymptotically stable. Furthermore, the synchronization between drive system and response system is realized. Finally, chaos synchronization of same and different parameters unified chaotic system are simulated. The numerical simulation results show the effectiveness of synchronization scheme.