Coupled map lattices are taken as examples to study synchronization of spatiotemporal chaotic systems. Based on Lyapunov stability theory, global synchronization of two unilateral coupled map lattices is realized through appropriate choice of driving functions. Simulation results show the effectiveness of the method. The effect of control parameters on the rate of synchronization is further discussed. Simulation results also show that synchronization can also be realized when there is a systematic bias and system noise, which shows that the method has certain anti-jamming capability.