Based on the meteorological data of Yunnan Province from 1981 to 2010, according to the method specified by the construction industry standards and national standards, such 5 building thermal engineering meteorological parameters as climate regions, the number of heating degree days, the number of airconditioning degree days, the average temperature of the coldest month, and the average temperature of the hottest month of 125 towns of Yunnan are calculated. The surface temperature of buildingenvelope thermal bridge and heat transfer coefficient are simulated to provide a practical reference for the architectural design in Yunnan. The results show: in order to improve the precision and practicability of meteorological parameters of buildings, the actual monthly temperature and the climate data of 30 years in all stations of Yunnan should be used; thermal design must satisfy the winter heat preservation requirements in most parts of Yunnan; for thermal bridge, it is essential to choose the building materials with small thermal insulation to prevent condensation phenomenon.