The　passive　solar　house　in　Beijing　area　where　solar　energy　resource　is　abundant　in　winter　was　taken　to　study.　The　properties　such　as　long-time　sunshine　and　intense　solar　radiation.　Based　on　building　thermal　physics,　heat　transfer　and　phase　change　storage　theories,　the　feasibility　and　energy　conservation　characteristic　of　the　composite　phase　change　material(PCM)　wallboard　in　the　passive　solar　house　were　studied　by　the　methods　of　computer　simulation　and　experimental　analysis　were　studied,　which　provides　useful　reference　for　the　application　of　heat　storing　technology　of　the　PCM　and　the　utilization　of　renewable　energy　in　the　building　energy　conservation.