In recent years, BIM technology has been widely used in municipal road engineering, its application value in design phase is more and more important. However, there are still many problems in multi-discipline modeling and multi-discipline inheritance application of BIM technology in the early design stage. In order to solve the problems such as the slow overall progress of multi-disciplinary modeling, the difficulty of multi-disciplinary integration, and the poor visual expression effect of the overall scheme in the early phase of municipal road design, the author explores a number of practical application technology routes of BIM in the early phase of municipal road design through the practical experience of many projects. Taking Hongye Eroad as the main modeling software and Infraworks as a technical route of final integration software, the whole process of BIM implementation in the early phase of municipal road engineering design will be introduced in detail.