The　temperature　profiles　of　thermoacouistic　convection　in　a　tube　under　periodical　heating　at　end　were　investigated　experimentally.　The　periodical　heating　system　was　controlled　by　a　triode　and　the　heating　frequency　could　be　adjusted　by　altering　the　signal　of　the　signal　source.　Argon　was　used　as　working　substance;　its　temperature　in　every　heating　frequency　was　measured　and　compared　to　the　value　under　the　condition　of　continuous　heating.　The　results　showed　that　excess　temperature　existed　at　every　measuring　point　because　of　thermoacoustic　waves　propagating　in　the　tube,　singular　temperature　distributions　appeared　at　some　measuring　points.　These　results　verified　the　existence　of　excess　temperature　experimentally,　could　lay　foundations　for　the　further　study　of　the　thermal　effect　of　thermoacoustic　waves.