Based on the distinguish of the two types of El Nio events, the correlations between precipitation, temperature and runoff and El Nio were analyzed by running mean, respectively. And the changes of the temperature, precipitation and runoff from mountainous watershed of Hexi Corridor region caused by the two types of El Nio from 1959 to 2005 were studied by anomaly analysis method. The result is that Hexi Corridor region is strongly influenced by the El Nio. Temperature raising, precipitation and runoff decreasing are the features in the first pattern of El Nio event, but temperature decreasing, precipitation and runoff raising in the second one.The responses of temperature to El Nio events are stronger in plain than mountain regions, the responses of precipitation to El Nio are obvious in both mountain and plain regions. The response of runoff to El Nio is lower than precipitation and air temperature because the runoff from mountainous watershed has a complex generate and concentrate process.

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