Introduction to the Outcome: The "12th Five-Year Plan" period is a critical stage for urbanization and rural development in China. The rapid growth in the construction area of villages and towns, as well as the improvement in residents' living standards, has further intensified the demand for energy used in commodity production in these areas. This project aims to develop low-grade energy comprehensive utilization technologies suitable for village and town buildings based on the economic development level, climate characteristics, and resource features of China's villages and towns. It constructs an industrial chain for the utilization of low-grade energy in village and town buildings, a complete set of equipment production base, and large-scale engineering demonstration, assisting relevant government departments in formulating corresponding preferential policies and incentive mechanisms. Technical indicators: Optimize the energy supply system, develop advanced technologies, fully utilize the abundant low-grade energy resources found in rural and township areas, and economically and efficiently meet the needs of energy use in village and town buildings. In general, the focus will be on energy cascade utilization such as ground source heat pump technology, low-temperature heating systems, evaporative cooling technology, composite ventilation and cooling technology, shading technology, The company focuses on technological development and integration in multiple aspects such as efficient gasification of straw, reliable temperature-controlled gas supply technology, etc. The key challenge is to overcome the critical technologies for the efficient and reliable use of low-grade energy. A batch of products that meet the energy needs of rural buildings in different regions of China will be developed. The application and demonstration of low-grade energy utilization and energy-saving technologies in rural buildings will be carried out to promote the widespread use of these technologies in the countryside. This will reduce the dependence of rural residents on commercial energy and pave a new path for sustainable development in rural building energy supply. The application of fSSiH: urbanization and urban development