Abstract: BIM Technology was applied in the construction of Guangzhou metro line 6 second phase of the mechanical and electrical installation and public area decoration project. The different profession construction units completed the construction model according to the design drawings, the site supervision organized the various professional construction units to finish the model merge. There were many problems in model merging process. This article gives a brief analysis and puts forward feasible solutions, and looks forward to the model merge in the late subway line construction.