Abstract: The fly ash and carbide slag are used as the main raw materials to make the mine filling cementitious materials. The setting time and strength of cementing materials were also studied. By adopting the method of single factor variable and selecting different amounts of fly ash and carbide slag as experimental variables, the compression strength and flexural strength of cementing materials for 7 days and 28 days were studied. Meanwhile, the microscopic stuctures of the cementitious material were studied through SEM. The study found that: the setting time reduced with the increase of content of fly ash and carbide slag; with different contents of fly ash (50%, 55%, 60%, 65%, 70%) , the strength gradually reduced with the increase of the fly ash content. The early strength loss is more particularly. With different contents of carbide slag (3%, 6%, 9%, 12%, 15%), the strength gradually increased with the increase of the carbide slag content.