  In the present letter, we introduce a new method to quantify the effect of
disorder on spatiotemporal chaos [Y. Braiman, etc. Nature, 378, p465 (1995)].
Base on the autocorrelation function, we define a parameter to measure the
effect of disorder. The results are intriguing and similar to the results
obtained by J. Lindner etc. [J. Lindner, etc. Physics Letters A, 231, p164
(1997)]. Using this order parameter, the effect of disorder on spatiotemporal
chaos in different conditions has also been discussed.
