Using the global monthly sea surface temperature(SST) from the Hadley Climate Prediction and Research Center,NCEP/NCAR daily wind field and specific humidity,and 753-station daily precipitation and 160-station monthly precipitation data from the National Meteorological Information Center,the differences in the low-frequency characteristics of the precipitation and its related moisture transport paths in the Yangtze River-Yellow River Basin in the following summer of eastern Pacific(EP) and central Pacific(CP) type El Niño events are analyzed.For the sake of clarity,precipitation is distinguished as EP-type and CP-type precipitation.The results reveal the following:1)For EP-and CP-type precipitation,the most significant frequency oscillation period is 10-20 d,followed by 20-30 d,while the weakest is 30-60 d.For the typical 7-year average time series of precipitation,the most significant is 10-20 d,followed by the 20-30 d low-frequency oscillation period for EP-type precipitation,yet for CP precipitation there is only 10-20 d significant low-frequency oscillation period.2)The zonal and meridional vapor flux are of significant 10-20 d,20-30 d and 30-60 d low-frequency oscillation periods,among which 10-20 d is the most significant,and this characteristic is more obvious especially for meridional vapor flux.When comparing the two types of events,the significance of the 10-20 d and 20-30 d low frequency cycles are equivalent for both the EP-and the CP-type zonal water vapor fluxes,and the 30-60 d cycle of EP-type zonal water vapor flux is slightly stronger than that of the CP-type.In the meridional water vapor flux,the EP-type is slightly weaker(stronger) than the CP-type in the low frequency period of 20-30 d (30-60 d).3) The main low-frequency water vapor circulation systems which affect the low-frequency heavy precipitation over the Yangtze River-Yellow River Basin in the following summer between the EP-and CP-type El Niño events are different.The main and most common 10-20 d vapor circulation systems affecting both the EP-and CP-type low-frequency precipitation include the anomalous anticyclonic moisture circulation around the Philippines,the anomalous cyclonic(anticyclonic) moisture circulation to the Bohai Gulf (southeastern Sea of Japan).In addition,the 10-20 d vapor circulation systems which affect the EP(CP) type low-frequency precipitation also include the anomalous cyclonic moisture circulation to the northeast of the Balkhash (the anomalous cyclonic moisture circulation pairs around the Bay of Bengal and to the west of Sumatra,and the anomalous cyclonic and anticyclonic moisture circulation to the western and eastern sides of Lake Baikal,respectively).4)The water vapor sources of low-frequency strong precipitation for both the EP-and CP-type heavy precipitation in the summer of the following year are also different over the Yangtze River-Yellow River Basin.Warm vapor originates from the South China Sea,cold vapor from the northwest Pacific,and cold air from the northeast of Balkhash and northeast of Lake Baikal for the EP-type precipitation.A small amount of warm vapor originates from the Arabian Sea and Indian Ocean,while a large amount of warm vapor originates from the tropical Western Pacific,and cold air from the northeast to Lake Baikal for CP-type precipitation.