Abstract—In order to obtain the relationship between cli-mate seasonal change rhythm and the human thermal adap-tation for Chinese youth in cold climate zone, a long-term thermal comfort field survey was conducted in campus buildings in Xi'an, China. A total of 1100 valid question-naires were obtained, including indoor and outdoor thermal environment measurements and subjective questionnaires. The results showed that the sensitivities of TSV responding to indoor operative temperature in spring, summer, autumn and winter were 0.048, 0.284, 0.045 and 0.140, and the neu-tral temperatures were 19.5 °C, 25.8 °C, 25.4 °C and 16.5 °C, respectively. Meanwhile, the clothing insulation varies with indoor operative temperature in four seasons were -0.066, -0.011, -0.081 and -0.036. The seasonal adaptive thermal comfort models were then established. It is pointed out that human thermal adaptation changes with a significant sea-sonal rhythm, the seasonal variation of human adaptation is not only related to the climatic characteristics of each season, but also related to the thermal experience provided by the previous season.