This peper discusses the synchronous characteristics of conflagrations occured in the Past 3000 years in China and Points out that the predominant periods appered appropriately in the eight stages,that is 600 - 90a B. C, 60 - 0a B. C,100-200a A. D, 480- 570a A. D,700-850a A. D,1 120- 124be A. D, 1500- 1600a A. D and 1660-1760a A.D.By means of time series spectrum the synchronous periods of fire dissaters have been obtained,such as 517, 173, 129,90, 63, 44, 32, 23, 16and 11 years.Through contrasting the per...