The Autodesk Civil 3D is a BIM-based software in the field of highway municipal engineering with wild industrial recognition, which is able to complete the fast design of roads, sites and drainage planning by using its 3D dynamic model. The buttress retaining wall is a common structure in municipal road engineering. However, the model of the retaining wall module contained in the Civil 3D is single and fixed in size, which fails to meet the requirements of the actual design. In addition, the model of buttress retaining wall is unable to be established in batch through conventional methods. This paper takes a certain municipal engineering project as an example, and introduces the establishment of BIM model of buttress retaining wall in the project by using Civil 3D, Subassembly Composer and Dynamo software.