Abstract: To study the influence of loess on performance of cemented and high concentration backfill material with aeolian sand, the moisture content of stone body at different ages, the strength and slump were studied with different dosages of loess from 0 to 29.4% by water content test, slump test and compression strength test. The results show that: the moisture content of filling material stone body at 3 days, 7 days and 14 days increases with the increase of loess content; the strength of cemented and high concentration backfill material with aeolian sand will not decrease significantly by the addition of loess, moreover, with the increase of loess content and the growth of age, the strength of backfill material will gradually increase; the fluidity of the material varies little with the addition of 0 to 11.8% loess, but it will drops sharply as the content of loess is more than 11.8%.