The　problem　of　environmental　pollution　caused　by　construction　waste　become　more　and　more　serious,　it　has　been　attracted　extensive　attention　of　the　society.　To　solve　the　problem　of　disposal　of　waste　slurry　in　cast-in-situ　bored　pile　construction,　this　paper　introduces　a　method　of　using　chemical　flocculant　to　separation　of　solids　from　liquid　for　the　waste　slurry　through　the　test.　The　method　realizes　the　fast　Solid-Liquid　Separation　for　waste　slurry　by　adding　polyacrylamide　and　CaO.　After　the　treatment,　the　waste　slurry　become　more　loose　like　dry　soil,　and　this　method　has　advantage　in　convenient　transportation,　simple　procedure,　fast　treatment　cycle,　effectively　improves　the　problem　of　environmental　pollution　and　reduces　the　processing　cost.　It　suitable　for　different　consistency　of　waste　slurry　caused　by　constryction.　©,　2015,　Shuili　Xuebao/Journal　of　Hydraulic　Engineering.　All　right　reserved.