Abstract: Al and Ga resources,widely distributed in coal,are important strategic mineral resources. At present,re- search on Al and Ga resources in coal measures increases,but it has not formed a scientific and reasonable evaluation system. Based on the characteristics of Al and Ga resources in coal,authors identified 10 main indexes for the evalua- tion of Al and Ga resources in coal,and built an evaluation system model using AHP-GCA method. Using the scores given by experts,the authors can identify the indexes factors weights of Al and Ga resources in coal. Combining with the current research of coal and associated resources and related regulations,the authors assigned the indexes.