Abstract: Global-climate-change problem poses new demands for tourism. Estimating carbon emissions from tourism is the basis for further research on low-carbon tourism, which is of great significance to the development of low-carbon tourism.Based on input-output method, this paper estimates the direct carbon emissions of tourism in Hunan province from 2008 to 2014, analyzes the evolution trend of carbon intensity and per-person carbon emission in tourism industry of Hunan Province, and uses GRA method to analyze the correlation of each tourism sectors impact of the total tourism carbon emission. The research shows: (1) The direct carbon emissions of Hunan tourism from 2008 to 2014 grew rapidly, from 2.9525 million tons to 7.8314 million tons; (2)Transport, catering, shopping and accommodation sector accounted for more than 90% of total tourism emissions from 2008 to 2014, those are main directions of carbon reduction. (3)The tourism carbon intensity and per-person carbon emission of Hunan Province show a downward evolution trend. (4)The correlation between sectors carbon emissions and total carbon emissions of Hunan tourism involves food, housing, transportation, sightseeing, shopping and entertainment is ranked as follows: Sightseeing(0.9296)>Tourism Catering(0.8456)>Tourism Transportation(0.8254)>Tourist Accommodation (0.8092)>Travel Shopping (0.7109)>Others (0.5732). (5)Changing traditional way of sightseeing is the breakthrough point for Energy conservation of tourism. Also, promoting low-carbon transportation concept and low-carbon transportation mode are Equally important.