The idea of BIM is correct and the technology of BIM is applicable, but the software of BIM is not perfect. Based on the features of water treatment projects, two collaboration patterns provided by REVIT will be discussed in this paper. The first one is to use LINK pattern, another one is to use work set pattern. However, the effects of using those patterns are not ideal. According to the advantages and disadvantages of two patterns, a new way, which combines two patterns, has made a little progress, but it still cannot meet the design requirements. The main problem, which leads to that result, is how to divide the boundary conditions of two patterns. After some procedures are tried, the solution has been determined. The work set is established according to architecture, structure and MEP, and LINK pattern is going to be applied to the former building, site and etc.