Prefabricated　concrete　(PC)　components　need　to　be　maintained　after　pouring　to　guarantee　that　concrete　can　harden　well　in　a　certain　period.　Currently,　steam　maintaining　is　one　of　the　commonly　adopted　methods　for　this　purpose.　However,　it　is　a　bit　costly　and　consumes　a　large　amount　of　fossil　energy.　Based　on　the　characteristics　of　maintaining　process　of　PC　components　and　the　thermal　characteristics　of　GH　series　phase　change　materials　(PCMs)　developed　by　our　team,　this　paper　presents　an　integrated　design　principle　of　passive　solar　energy　and　phase　change　heat　experiments.　Further,　the　selecting　principle　of　PCMs　on　the　inner　surface　of　the　main　sun-facing　wall　of　curing　buildings　wasput　forward.　The　application　results　of　Hebei　province,　China　showed　that,　the　50mm-thick　GH-37　PCM　(temperature　range　of　phase　transformation:　37.4-43.5　and　phase　change　enthalpy:　227.5kJ/kg)　was　suitable　for　the　main　sun-facing　wall.　Compared　with　GH-33　PCM,　GH-37　PCM　allowed　the　inner　surface　temperature　of　the　main　sun-facing　wall　to　increase　by　3.4　on　average　at　night,　the　upper　surface　temperature　of　PC　components　to　increase　by　1.4,　and　the　heat　storage　and　release　rate　of　PCM　wall　to　increase　by　62%.　This　research　suggests　a　new　method　for　renewable　energy　utilization　and　low-carbon　based　environmental　protection　in　PC　component　curing　process.　©　2021,　Chemical　Industry　Press　Co.,　Ltd.　All　right　reserved.