Abstract: Taking Geheyan hydropower development in Qingjiang River Basin as the analysis object. The comprehensive benefit of carbon emission reduction in the whole process of hydropower development is estimated by hybrid analysis method. The results shown that the carbon emission per unit power generation of Geheyan Hydropower Station is 33.22gCO₂eq/ kW·h, which is much better than that of thermal power generation. And the tourism industry derived from hydropower development can reduce 2282100 tons CO₂ , the shipping industry derived from hydropower development can reduce 1060290 tons CO₂. The derivative industry has significant benefits in reducing carbon emissions. The comprehensive annual average carbon emission reduction benefit of Geheyan hydropower development is 2975500 tons of CO₂. Hydropower development has very obvious benefits of carbon emission reduction, and it is a powerful means of carbon emission reduction.At the same time, derivative industries often have a low-carbon nature, in the development process, we need to consider the guidance of derivative industries as a whole to further increase the benefits of carbon emission reduction.

Key words: hydropower development, carbon emissions, carbon emission reduction