In this paper, an impulsive control for synchronization of a class of unified chaotic systems with channel time-delay and parameter uncertainty is proposed. The practical stability of impulsive synchronization between two nonautonomous chaotic systems is studied. This practical stability is equivalent to that of the synchronization error system at the origin. Based on the theory of impulsive differential equation, the criterion for the practical stability of the synchronization error system at the origin is presented. Numerical simulations show the effectiveness of the method.