This paper studies the sustainable development capability of wind power project, and establishes the evaluation index system from four aspects: wind resources, wind power accommodation, operation status and financial status. On this basis, the gray correlation analysis and topsis method are used to construct the evaluation model of wind power project sustainable development capacity, and finally five wind power projects were selected for case analysis. This paper established the evaluation model of sustainable development capacity of wind power project based on gray correlation analysis and topsis method, can not only help the wind power enterprises to formulate the development plan, but also can provide some theoretical support for government and other departments to formulate relevant policies.