Abstract: Scientific and reasonable evaluation of the social adaptability of the Three Gorges migrants is very important for maintaining social stability and promoting the sustainable development of the migrants. Firstly, combined with relevant literature, field research data and expert opinions, this paper establishes the evaluation index system of social adaptability of Three Gorges migrants. Then, OWA-AHP method, principal component analysis method and game theory fusion weight method are used to determine the weight of each index. At the same time, GRA, KL distance and TOPSIS method are combined to construct a new form of relative entropy（KL distance） instead of European distance and a new form of relative closeness to rank and evaluate the evaluation objects. Finally, the emigration of the Three Gorges in Guangdong Province is used as an example. The results show that the model can objectively reflect the social adaptability of the Three Gorges migrants, and the evaluation results are consistent with the actual situation, which verifies the effectiveness and practicability of the model. The research results, index system and evaluation model in this paper can provide effective ideas for the social adaptability of reservoir immigrants.