To　make　full　use　of　the　strong　solar　radiation　in　solar　energy　abundant　area,　this　paper　proposes　generalized　non-balanced　thermal　insulation　system　in　building　envelope,　among　which　the　south　wall＇s　thermal　insulation　performance　should　be　reduced　to　better　use　solar　energy,　while　the　north　wall＇s　thermal　insulation　performance　should　be　strengthened　and　the　east/west　walls＇　take　the　second　place.　Based　on　the　difference　of　outdoor　synthetic　temperature　in　different　orientations,　the　non-balanced　heat　transfer　coefficient　is　calculated　under　condition　of　constant　heat　flux.　Take　Lhasa　region　as　a　calculation　example,　the　testing　of　indoor　thermal　environment　in　winter　is　conducted　and　the　outdoor　synthetic　temperature　of　different　orientations　varies　widely.　The　new-type　non-balanced　thermal　insulation　system　is　built　in　which　north　external　wall＇s　thermal　insulation　is　reinforced　significantly;　east/west　wall＇s　thermal　insulation　takes　second　place　and　south　external　wall　needs　no　thermal　insulation.　The　internal　surface　temperature　of　the　external　walls　under　two　kinds　of　heat　transfer　coefficient　limit　values　and　frequency　response　of　the　two　kinds　of　thermal　insulation　wall　constructions　are　analyzed　using　the　wall　thermal　theoretical　method.　This　paper　provides　theoretical　reference　to　design　generalized　non-balanced　thermal　insulation　system　in　building　envelope.