Abstract: In order to recover the fine sand resources in a tailings pit of Huzhou city, the fine sand resource reserves were assessed and the experiment of separation and recovery of fine sand was carried out.The technological scheme of centrifugal classifying desliming and sand sorting is determined as taking mud content of sand, sand content of mud and classification efficiency as evaluating indicator.The calculation and analysis show that the amount of fine sand in the tailings was about 1.2 Mt when +0.045 mm was recovered, and the desliming effect of hydrocyclone is better.When the feed concentration is 12%-13% and the feed pressure is 0.1 MPa, the mud content of sand is 13.7%, the sand content of mud is 4.8%, the fractional efficiency is up to 83.5%.