The　continuous　heat　flux　method　for　realizing　the　aluminum　freezing　point　using　a　sodium　heat　pipe　furnace　is　described.　The　depression　of　aluminum　freezing　temperature　is　less　than　0.6　mK　within　three　hours　after　the　freezing　temperature　arrives　at　the　maximum.　Also,　it　is　necessary　to　form　one　inner　and　one　outer　solid-liquid　interface　when　realizing　the　aluminum　freezing　point　at　the　highest　level　of　accuracy.　The　realized　freezing　temperature　plateau　will　fluctuate　if　the　inner　solid-liquid　interface　is　destroyed.　Moreover,　it　is　very　helpful　to　postpone　this　phenomenon　by　inserting　a　silica　glass　tube　at　the　room　temperature　into　the　thermometer　well.