Results of the analysis suggest that during the recent 100 years there exists a strong correlation between the El Nino/La Nina phenomenon and Beijing′s rainfall in summer(June —August),mean monthly maximum temperature (July) and mean monthly minimum temperature in winter (January).El Nino phenomenon appears a negative-correlation with the summer rainfall and the mean monthly minimum temperature;whereas a positive correlation with the mean monthly maximum temperature in summer.La Nina phenomenon appears a positive correlation with the summer rainfall and the mean monthly minimum temperature in winter;whereas a negative-correlation with the mean monthly maximum temperature in summer.