To forecast the effect of precipitation on runoff scientifically,the change trend and the correlation time scales of basin precipitation and runoff in Hunhe River basin are analyzed with the help of accumulated anomaly and 5-year moving-average method based on the monthly data of precipitation and runoff in Hunhe River basin within 56years(1956—2011).The results showed that:(1)the precipitation and runoff concentrated from June to September(especially in July),and runoff concentrated from July to August,the...