With　the　rapid　development　of　cities,　the　proportion　of　building　carbon　emissions　in　the　total　carbon　emissions　of　cities　is　increasing,　and　the　carbon　emission　intensity　of　commercial　buildings　is　higher　than　that　of　other　building　types.　The　relationship　between　commercial　building　life-cycle　carbon　emissions　and　urban　form　factors　at　the　block　scale　and　the　spatial　differentiation　of　building　carbon　emissions　in　commercial　blocks　remain　unclear.　In　this　study,　a　calculation　method　for　building　life-cycle　carbon　emissions　in　urban　commercial　blocks　was　established　using　(1)　GIS　technology　to　establish　a　commercial　district　building　model　and　urban　form　factors　and　(2)　block　model　classification　according　to　architectural　layout　and　combination　as　well　as　typical　layout　pattern　extraction　through　morphological　type.　Additionally,　(3)　building　life-cycle　boundary　and　scenario　parameters　were　determined,　and　the　urban　modeling　interface　(UMI)　platform　was　used　to　numerically　simulate　block　samples　and　typical　layout　modes　for　carbon　emission　calculation　model　construction.　Beijing　was　chosen　as　a　calculation　and　analysis　example.　The　results　indicated　that　building　shape　factor　(BSF)　is　an　important　indicator　of　carbon　emissions　and　that　the　impact　of　building　density　(BD)　on　carbon　emissions　is　twosided.　The　spatial　differentiation　of　carbon　emissions　is　obvious,　which　could　provide　effective　suggestions　for　target　building　planning.　By　studying　carbon　emission　indicators　under　typical　layout　modes,　we　found　that　lowrise　building　+　tower-enclosed　(L　+　T-E)　and　low-rise　building　+　tower-determinant　(L　+　T-D)　are　the　best　layout　modes.