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Considering the hidden danger in the finished stopes in underground metal mines in China, a new cavity data acquisition method based on 3D laser scanning technology is proposed in Dahongshan mine district. This technology uses contactless measurement mode, by which not only the geometric parameter of cavity such as length, area, volume, deformation of roof and wall rock can be gained accurately, but also the security and efficiency of cavity data acquisition are greatly raised. It provides relatively reliable datum for the safety evaluation and the control of emptied stopes as well as the design of ore column stopping. There is certain particularity in application method of 3D laser scanning technology for the finished stopes in mine. For the sake of enhancing the precision and reliability of obtained datum, in this paper, based on systematic analysis of measurement errors of CMS, the key systematic errors of side rolling, pitching and orientation were discussed in detail, and the corresponding calibration method was put forward.