To better improve the efficiency of design and construction integration of urban underground integrated pipe gallery projects, this paper analyzes the reason of lacking design and construction integration under the traditional mode from three aspects of information flow, professional collaboration and process management. Application of the BIM technology is able to optimize the whole progress of the design and construction integration, and three optimization modes are attempted to be established including the design coordination mechanism, the construction coordination mechanism and the design-construction integration mechanism of the integrated pipe gallery based on BIM technology. A case analysis is conducted to verify the feasibility of the design and construction integration coordination mechanism, which proves that the optimized modes is of great reference significance in realizing deep fusion of design and construction stages.