Abstract: Effectively utilizing renewable energy sources such as solar energy and air energy is an important technological approach to reducing carbon emissions from building operations. With the increasing demand for indoor thermal comfort,the heating demand in hot summer and warm winter area is becoming increasingly urgent during some parts of the winter. Based on this,this paper focuses on the heating demand of a building room in Guangzhou during some parts of the winter,and takes it as the heating object to build a solar-air source underfloor heating system,and the heating performance of this system is studied. The air temperature and heating capacity of the heating room are tested through experiments,and evaluation indicators such as solar energy utilization rate,air thermal energy utilization rate,renewable energy utilization rate,and solar energy contribution rate are calculated. The research results show that under testing conditions,when the outdoor average air temperature is 6.3 ℃,the solar-air source underfloor heating system can provide hot water of 55℃,and maintain the daily average air temperature of the heating room at about 18.9 ℃,which can meet the requirements of relevant standards for air temperature in winter heating rooms. During the testing period,the average renewable energy utilization rate of the solar-air source underfloor heating system is 48.2%,and the solar energy contribution rate is 11.4%. The data shows that the solar-air source underfloor heating system not only meets the heating demand of hot summer and warm winter area,but also effectively utilizes renewable energy,reducing electricity consumption and carbon emissions. The research results can provide data reference for the design and performance evaluation of renewable energy heating systems.