Abstract: Tibet is located in an extremely cold and high-altitude area with abundant solar energy，dry and cold climate， fragile ecological environment，long winter and large day and night temperature difference. Thus，it is urgent to solve the problem of heating in winter. According to the local resources characteristics，climatic conditions，and heating demand of public and civil buildings，a large-scale solar collecting and heat storage system suitable for high-altitude area has been developed through product and technology innovation. This heating system has been verified by large-scale solar central heating demonstration projects in Nagarzê County of Shannan Region and Zhongba County of Shigatse City at an altitude of 4 700 m. Data from the heating seasons show that the demonstration projects are safe and stable in operation，advanced and reliable in technology，and ecnomic in annual operating cost，which satisfies Tibet's demand for heat supply with clean energy. The research results can provide technical support and solutions for the heat supply with clean energy in extremely cold and high-altitude areas，such as Tibet and Qinghai .

Key words: solar heating, extremely cold and high-altitude Tibetan area, heat collection and storage, central heating, demonstration project, clean energy, clean heat supply