Abstract: Liuhuanggou coal mine is one of the typical coal mines with repeated mining of huge thick multi -seam coal mine. In the early stage of coal mining, the shallow ground subsidence is relatively small, and there is a lack of effective subsidence monitoring data, making it impossible to verify whether subsequent mining will cause abnormal ground subsidence. With the background of repeated mining conditions of multiple coal seams in Liuhuanggou Coal Mine, combined with the mining conditions of the mine, we carried out the research on the characteristics of repeated mining land subsidence by using two kinds of monitoring means, namely, the conventional manual monitoring of ground measuring line and the LIDAR three-dimensional monitoring of the ground surface subsidence. The measured results show that the period from August 1, 2022 to December 28, 2022 is the main period of land subsidence. The mining of the (9 - 15) 08 working face caused a large amount of land subsidence, with the maximum subsidence value tending towards the upper part of the (4-5) 04 working face in the deep part. The risk of a sudden large-scale land subsidence in the later stage is extremely low. It is predicted that the maximum land subsidence will be 4. 6 m before the mining of (9-15)08 working face, and after the mining is completed and stabilized, The maximum surface subsidence is 16. 9 m. Land subsidence measurements provide a basis for revealing the laws of land subsidence and abnormal collapse under repeated mining conditions in the Liuhuanggou Coal Mine, and for in-depth study of the damage characteristics of the overburden rock of the comprehensive mining in the Changji Mining Area in Xinjiang, and the comprehensive technical methods adopted provide important technical support for ecological environmental protection in the mining area.