In this paper-the practical stability of impulsive synchronization between two-nonautonomous chaotic systems is studied. This practical stability is equivalent to that of the origin of the synchronization error system. We present the crite ria for the practical stability of the origin of the synchronization error syste m based on the theory of impulsive differential equation. We also provide the theoretical results on the range of synchronization errors. Numerical experimental-results are given to compare with theoretical results.