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Lhasa is located in the middle of the Tibetan plateau, north of the Himalayas, its climatic characteristics and the form of residents are representative of the Tibetan Plateau. In order to master the indoor thermal environment of rural highland in Tibet, this paper tests the indoor and outdoor thermal environment parameters of a passive solar heating house in Lhasa, and analyzes the test results. The results show that the solar radiation intensity is high and the sunshine time is long, which is suitable for the development of passive solar energy buildings, and the interior space of the rural buildings is rationally arranged based on the use function, which can effectively improve the temperature of the main rooms. The variation law of indoor air temperature and wall temperature is approximately the same, and there is a certain phase difference between the two kinds of temperature waves;The relative humidity of the indoor air fluctuates between 18% and 32%, and the relative humidity of the indoor air is small, and the indoor humidity environment should be improved. The results of this study can provide theoretical reference for indoor thermal environment improvement in this area.