In　order　to　solve　the　problem　that　the　thermal　performance　evaluation　method　of　the　existing　enclosure　structure　cannot　be　applied　to　the　composite　phase　change　enclosure　structure,　the　dimensional　analysis　method　and　simulation　method　are　used　to　analyze　the　relationship　between　heat　storage　coefficient　of　phase　change　material　and　its　thermal　properties,　and　construct　further　the　calculating　method　of　the　heat　storage　coefficient　of　phase　change　materials.　The　results　show　that　the　heat　storage　coefficient　of　phase　change　material　is　proportional　to　the　square　root　of　its　density,　thermal　conductivity　and　effective　specific　heat　capacity.　The　heat　storage　coefficient　of　developed　phase　change　material　is　16.20　W/(m2•K),　is　1.24　times　of　that　of　punning　soil　and　1.54　times　of　that　of　block　bricks　and　45　times　of　that　of　polystyrene　boards,　respectively.　Therefore,　using　phase　change　material　in　envelop　structure　can　get　the　better　thermal　stability.　This　study　can　provide　reference　for　the　efficient　application　and　scientific　evaluation　of　phase　change　material　in　buildings.　©　2018,　Editorial　Board　of　Acta　Energiae　Solaris　Sinica.　All　right　reserved.