Abstract: In order to address the technical challenges of difficult processing of fine particle tailings,low filling concentration,and poor filling body strength in Xiadian Gold Mine,experimental research was conducted on the physical and chemical properties of filling materials,settling characteristics of fine tailings,strength ratio of fine tailings,and flowability performance of fine tailings filling slurry.A technical renovation plan for the filling system in Xiadian Gold Mine was proposed and implemented on-site.The goal was achieved to have the filling body strength of ≥1 MPa at 3 d for fine tailings (-74 μm) with a cemented sand ratio of 1∶7-1∶8 and a filling capacity ≥60 %.This improvement met the requirements of the Xiadian Gold Mine,not only solving the discharge issues of fine tailings but also reducing the pressure on tailings storage capacity while increasing the utilization rate of mine tailings.