In order to study the synthetic effect of temperature,humidity,wind speed and solar radiation on human thermal sensation,a human bioclimatic classification is worked out by means of effective temperature and wind-chill index.Climatic data of 657 weather observatories for last 30 years of the country are used.The results show that the whole country can be generally divided into 27 bioclimatic areas in winter and 20 bioclimatic areas in summer. The classification'is of important reference value for human activities such as tourism, settlement,urbanization,military activities etc.