Abstract: The unique topography of Sichuan Tibetan area and the low temperature and high altitude climate characteristics has caused the traditional sewage treatment process in the mainland not be applied to the Tibetan area of Sichuan. Through the field research, test, process comparison and other aspects of the analysis, the types of sewage treatment process suitable for low temperature and high altitude areas were summarized to provide theoretical and technical support for rural domestic sewage treatment in Tibetan areas of Sichuan province. Combing with actual engineering cases, it was provided sewage treatment process technology reference for other similar environmental areas.