Abstract: Paste filling technology has the advantages of environmental protection, economy and efficiency, and it is the direction and trend of the development of mine filling.The sedimentation and concentration technology of the unclassified tailings has a direct impact on the efficiency of the paste process, the quality of the paste slurry and the production cost.Based on the overview of process characteristics of the deep cone thickener, this paper detailly introduces the application and improvement of paste filling process with deep cone thickener in a domestic copper mine.Aiming at the problems such as instability of tailings slurry feeding parameters (tailings particle size and mass concentration) and discontinuous filling, the cyclone is added to control the feeding parameters and the deep cone thickener feeding rule of “control firstly, adjust secondly and stabilize thirdly” is adopted in the production.And with the help of digital and intelligent technologies, paste filling process with deep cone thickener in a domestic copper mine is realized.The underflow concentration of the deep-cone thickener reaches 72%-76%, the filling slurry concentration is controlled at 74%-76%, and the 28 d uniaxial compressive strength of the backfilling body with cement-sand ratio of 1∶4 reaches more than 5 MPa.