This　study　takes　one　solar　greenhouse　of　a　vegetable　planting　base　in　Beijing　district　as　the　research　object,　and　a　new　composite　Phase　Change　Material　(PCM)　developed　by　our　group　was　applied　on　the　inner　surface　of　the　solar　greenhouse＇s　north　wall.　The　purpose　is　to　enhance　the　wall＇s　ability　to　collect　and　store　solar　energy　and　then　improve　the　indoor　thermal　environment　of　the　greenhouse,　and　increase　the　utilization　rate　of　solar　energy.　According　to　the　measured　data　from　Dec.　2010　to　Jan.　2011,　we　can　get　that　the　inner　surface　temperature　of　the　north　wall　with　PCMs　is　higher　2　similar　to　5(degrees)C　than　that　of　without　PCMs　at　night.　Using　PCMs　storage　energy　in　sunny　day,　the　heat　release　of　the　composite　PCMs　is　3.4　to　3.7　times　as　large　as　that　of　the　ordinary　brick　wall　with　the　same　volumes.　But,　the　heat　release　per　unit　mass　of　the　composite　PCMs　is　7.4　to　9.9　times　as　large　as　that　of　the　ordinary　brick　wall　at　night　And　the　shading　of　the　vegetables　can　affect　obviously　the　ability　that　the　PCMs　absorb　the　solar　radiation　energy,　so　the　influence　of　the　shading　should　be　fully　considered　in　the　planting　and　the　arrangement　of　the　PCMs.