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Climate change is an important factor affecting the sustainable development of tourist destinations.Based on the monthly observation data of the main meteorological stations on the ground in Tibet from 1960 to 2015,this paper constructs a tourism climate index model.This index is used to quantitatively evaluate the tourism climate changes in Tibet,and investigate the impact of climate change on tourism.The results show that from 1960 to 2015,the temperature in Tibet increased by 1.35℃,and the tourism climate index changed significantly,especially in the regions of Changtang,Ngari and Kunlun Mountain.The fluctuation of temperature-humidity index,wind-chill index and index of clothing of these areas was larger than that of other regions.The changes of each index in different months are different,where spring observes larger changes while summer observes smaller changes.The tourism climate index in northwest Tibet has increased,and the climate comfort period is expanding.In southeast Tibet,the comfort level has declined and the comfort level in the central part has been slowly increasing.The comfort index in the southeast part of Tibet has gradually declined,and the comfort index in central Tibet has slowly increased.According to the comprehensive assessment method including temperature and humidity index,wind-chill index,index of clothing and altitude adaptability index,the types of tourism climate index in Tibet can be divided into reduced,low-speed growth,medium-speed growth and rapid growth.Different regions should adopt altative tourism products,strengthen energy conservation and emission reduction technology applications and green infrastructure construction,and appropriately control the scale of tourism activities so as to adapt to and mitigate the impact of climate change on tourist destinations.