Abstract: Based on the on-site situation in the research area, this article fully utilizes the advantages and complementarity of BeiDou/GNSS and traditional precision leveling, and conducts comprehensive measurement analysis, achieving the organic unity and combination of BeiDou/GNSS and traditional precision leveling in monitoring complex landforms and underground space areas with complex features. Firstly, the basic working techniques and methods of BeiDou/GNSS surface deformation monitoring and precision leveling are introduced. Then, taking the surface deformation monitoring project in the old goaf collapse area of the Muchengjian coal mine in western Beijing as an example, the surface deformation monitoring data of the research area in the past year are analyzed, and the deformation status and trend are predicted and evaluated. This article can provide reference for the monitoring and research of surface deformation in the old goaf collapse area.

Key words: BeiDou/GNSS, recision leveling, old goaf collapse area, surface deformation monitoring