Two rare torrential rain took place in Shangli county from 2008 to 2014.The rainfall amount of 2014 torrential rain is smaller 58.4mm than 2008 torrential rain but water level of flood peak is higher 0.23m.And the mass who suffered flood disaster on May 25 2014 is more than 2008.5.28 and the extent which suffered flood disaster is more serious than 2008.5.28.Based on field investigation and flood mark measurement and analysis and calculation of rainfall and flood,two torrential rain are compared and analyzed in this paper.