A statistical simulation method for reconstrucing precipitation fields in thehistorical time is suggested from Monte-Carlo random simulation idea and the interrelation of distribution of drought and flood order in neighboring regions. With thismethod,the conditional distribution model of precipitation amount corresponding to thedifferent orders of drought and flood is fitted and the simulated precipitation records corresponding to the different orders of drought and flood are obtained through many numerical experiments for the last 500 years in China. These simulated records reproduce,to a certain extent,the characterisitcs of the large-scale precipitation fields in the history,thus turning them into precipitation fields. Results show that the reconstructed precipitation fields are useful to the study of climatic variations during very long historicaltime.