Abstract: An initial condition estimation algorithm for global coupled map lattice systems based on the symbolic sequence is proposed.The convergent condition for estimating initial condition and the relationship between estimation performances and system parameters are theoretically analyzed.When the parameters meet the requirement of astringency,even if the mapping process is contaminated by white Gaussian noises,the initial condition can still be estimated perfectly by the presented algorithm.This investigation provides a theoretical and practical basis for a better analysis and description of the physical process of the actual model.