This study aimed to analyse the winter indoor thermal environment of double-story commercial and residential building in herdsmen settlements of China Northwest mountain grassland area. The method of research is ?eld testing and data calculation analysis; include indoor air temperature and humidity, outdoor air temperature and humidity, outdoor wind speed, thermal comfort index. The result shows the relationship between indoor thermal environment, envelope materials, heating methods, location of rooms and building type. In addition, the in?uence was quanti?ed in 0~6.9 °C in winter. Finally, put forward three strategies to enhance the winter double-story commercial and residential building indoor environment.