Abstract: The composite filling cementing material with slag is a new kind of cementing material.Compared with cement, this filling material is much better with feature of higher strength, no pollution and lower cost.The analysis on the new tailings foam filling cementing material mortar by strength comparison and rheological experiments indicated that:with appropriate foam agent added, the strength of the cementing material is not reduced, but the uniformity of the slurry is increased.Under the same conditions, the consumption of cementing material can be reduced and its rheological properties increased.

Key words: Foam mortar, Filling material, Strength, Rheological property