Theboilingbehavioroftheliquidnitrogen(LN2)underthetransienthighheatfluxurgentlyneedstoberesearchedsystematically.Inthispaper,thehighpowershortpulsedurationlaserwasusedtoheatthesaturatedLN2rapidly,andthehigh-speedphotographyaidedbythesparklightsystemwasemployedtotakeseriesofphotoswhichdisplayedtheprocessofLN2'sboilingbehaviorundersuchconditions.Also,aspecialtemperaturemeasuringsystemwasappliedtorecordthetemperaturevariationoftheheatingsurface.TheexperimentsindicatedthatanexplosiveboilinghappenedwithinLN2bythelaserheating,andaconventionalboilingfollowedupafterthenewly-definedchangeovertime.Byanalyzingthetemperaturevariationoftheheatingsurface,itisfoundthatthelatentheatreleasedbythecrackofthebubblesinthebubbleclusterinducedbytheexplosiveboilingisanimportantfactorthatgreatlyinfluencestheboilingheattransfermechanism.