Large　applications　of　pre-mixed　mortar　and　the　dwindling　natural　sand　resources　make　people　feel　anxiety　about　the　sustainable　development　of　pre-mixed　mortar,　therefore,　it　is　imperative　to　find　replacement　of　natural　sand.　In　this　paper,　several　kinds　of　local　tailings　are　selected.　First,　the　basic　performances　of　tailing　sand　are　analyzed,　then,　the　effect　of　the　tailing　sand　on　the　performances　of　pre-mixed　mortar　are　tested.　The　tests　show　that　the　mortar　performance　meets　the　technical　requirements　absolutely　when　tailings　are　used　as　aggregate　mix　mortar.　When　tailings　substitute　the　natural　sand,　the　mortar　has　qualified　consistency　and　hierarchical　degrees,　but　the　strength　is　slightly　lower.　The　natural　sands　are　added　to　the　limestone　with　more　content　of　limestone　powder　which　enrich　the　aggregate　gradation,　decrease　the　porosity　of　the　aggregate　and　increase　the　fluidity.　Also,　both　the　consistency　and　hierarchical　degrees　of　the　mortar　are　very　good.　The　tailings　can　be　partially　or　completely　substituted　for　the　natural　sand　to　mix　the　mortar,　therefore,　the　exploitable　yield　of　the　natural　sand　can　be　reduced.　The　tailings　are　very　suitable　for　mixing　mortar.　©　(2013)　Trans　Tech　Publications,　Switzerland.