Abstract: Due to the influence of the goaf pattern and geological condition，the conventional physical survey for mined-out area lowered the accuracy.It can not accurately output the three-dimensional space information and make post analysis difficult.Laser detection technology solved this problem well.But for the goaf group with a lot of complicated and messy point pillars，a bigger difficulty exists in both pre-detection and post-modeling.With the goaf group in Jiangxi Tungsten Mine as background，the three-dimensional laser scanning system FARO was adopted to make precise detection，and the point cloud data generated from the survey were disposed with Geomagic-studio software.Then，the coupling of three-dimensional space model and FLAC3D numerical model based on Minesight software and 3Dmine software was further explored.The practice has proved that the three-dimensional spatial model based on FARO system can more accurately statistic the amount of residual ores in mined-out area and its size.On this basis，FLAC3D numerical model based on three-dimensional measured space model can be used to analyze the stability of the goaf group.

Key words: Precision detection, Goaf group, Point cloud data, 3D modeling, Point pillar