Abstract: With an objective and quantitive analysis, the monthly precipitation/temperature data are transformed into percentiles of Gamma/Normal distribution at all stations in the 1951~1990 period. Monthly composites are computed for precipitation/temperature with data covering ten ENSO events. Based on the amplitude and phase of the first harmonic, 18 precipitation regions, 7 temperature regions, 35 response periods of precipitation and 9 response periods of temperature are determind. In North China, the middle and lower basin of Changjiang River, and to the south of Changjiang River, the responses of precipitation to ENSO events are distinct from that in the others. Meanwhile, the amplitude of negative temperature anomaly is the strongest and the duration is the longest in the north-middle part of Northeast China