Abstract: In order to establish a scientific and reasonable evaluation index system of coal gangue hill reclamation suitability,this article put forward the method of combining correlation analysis with gray correlation analysis to optimize the evaluation index system of reclamation suitability for gangue hills.The correlation analysis excluded the repeated indicators with high correlation degree,the gray relational analysis screened the insignificant indicators with low impact on the system,eleven indicators were finally screened out,and the fuzzy comprehensive evaluation method was used to test the optimized index system.The results show that the optimized index system based on correlation analysis and grey relational analysis is reliable.It not only simplifies the initial index system greatly,but also makes the evaluation results more scientific and reasonable.