The project is located in the grassland of Siziwang Banner, which suffers from harsh climate and inconvenient energy supply. The large-scale grassland and the poor road accessibility made it difficult to transport building materials and large machines to the site. Based on the regional climate and resources, three structure systems - raw earth bag building, raw earth modular building and modern light-frame wood building- are developed, which are suitable for the grassland and are low-carbon and low-cost. They are all self-built systems without the use of large-scale machines during constructio