ThenonlocalsymmetryoftheBoussinesqequationisobtainedfromtheknownLaxpair.Theexplicitanalyticinteractionsolutionsbetweensolitarywavesandcnoidalwavesareobtainedthroughthelocalizationprocedureofnonlocalsymmetry.Someothertypesofsolutions,suchasrationalsolutionsanderrorfunctionsolutions,aregivenbyusingthefourthPainlev′eequationwithspecialvaluesoftheparameters.Forsomeinterestingsolutions,thefiguresaregivenouttoshowtheirproperties.