In　regions　with　abundant　solar　energy,　building　walls　facing　different　directions　absorb　very　different　amounts　of　solar　energy.　These　differences　should　be　considered　in　thermal　insulation　design,　unlike　the　current　design　standard　in　China,　which　does　not　take　directionality　into　account　when　calculating　the　limit　value　of　the　heat　transfer　coefficient　of　building　envelope.　To　address　this　short-coming,　this　article　proposes　a　generalized　non-balanced　thermal　insulation　system　for　the　building　envelope:　walls　receiving　greater　amounts　of　solar　energy　should　have　less　insulation,　while　walls　receiving　less　amounts　of　solar　energy　should　have　more　insulation.　By　analysis　of　outdoor　synthetic　temperatures　for　different　orientations,　non-balanced　heat　transfer　coefficients　are　calculated　under　a　constant　heat　flux　condition.　Considering　the　Lhasa　region　as　a　case　study,　the　testing　of　an　indoor　thermal　environment　in　winter　was　conducted,　and　a　novel　non-balanced　thermal　insulation　system　was　built.　The　internal　surface　temperature　of　the　external　walls　under　two　types　of　heat　transfer　coefficient　limit　values　and　the　frequency　responses　of　the　two　types　of　thermal　insulation　wall　constructions　are　analyzed　using　the　wall　thermal　theoretical　method.　The　results　show　that　this　new　thermal　insulation　design　can　make　better　use　of　solar　energy,　thus　reducing　conventional　heating.　This　article　provides　a　theoretical　reference　for　the　future　design　of　non-balanced　thermal　insulation　systems　for　building　envelope　and　also　provides　a　theoretical　calculation　method　for　the　part　of　building　envelope　thermal　design　in　the　national　standard　of　the　People＇s　Republic　China　(Thermal　Design　Code　for　Civil　Building-GB50176).