This work conducts carbon simulation and accounting of one public teaching building in South China. The calculation results show that the carbon emission of public teaching building is 2586.5 Tons of CO2 per year. Based on the simulation, Solar Photovoltaic (PV) system can achieve carbon reduction of 595.5 TCO2 per year, the total power of the PV system reaches 1201kWp, the average power generation of the system is 1025MWh/year, and the system efficiency is 68.1%. The PV system can reduce the carbon emissions of public teaching buildings by 23%. The utilization rate of the roof space of public teaching buildings reaches 64%. Based on the simulation results to analyse the models of colleges and universities participating in the carbon trading market, three models are proposed: unified integration into the national carbon trading market system, incomplete integration into the carbon trading market, and the establishment of a university carbon trading market