With the development of society, Building Information Modeling(BIM)technology is getting more and more attentions in all aspects of society. However, the BIM is not accurate constructed by the current methods, which can hardly be used in practice. The accurate BIM construction method has been proposed in this paper based on the fusion of multi-source data. The three-dimensional(3D)laser point cloud data(3D LPCD)can fuse geometric feature information of 3D LPCD with measurement data, building drawings and material picture information, to construct the fine BIM and enhance the application of fusion fine BIM in internal repairing projects.