Abstract: The new cementing materials stimulating activities of steelworks slag is tentatively exploited，based on the pre-exploratory test，net pulp test and mortar test for Sijiaying Iron Mine.In order to further test and verify the mechanical properties of the new cementing materials，the suitable new filling cementing materials for Sijiaying Iron Mine is obtained from the researches on the new cementing materials in pilot tests with different mortar and concentrations.

Key words: New cementing materials, Compressive strength, Cement-sand ratio, Concentration