Abstract: With the increasing complexity of rail transit engineering construction, traditional on-site management and safety assurance measures are no longer able to meet the requirements of modern construction for early prediction, early detection, and rapid handling of hazards. Developing advanced digital technologies to assist on-site management has become an urgent need in the industry. This article focuses on the difficulties in the layout of rail transit sites, such as limited available areas, difficult site layout, and lack of scientific layout guidance. Based on summarizing the safety and production characteristics of existing construction industry sites, it deeply discusses the use of "unmanned aerial vehicles+3D laser scanning systems" to explore the hydrological conditions of surrounding buildings. With "SLP based optimization layout of rail transit engineering sites" as the core, it provides a simulated on-site deployment and pre trial and error for improving engineering efficiency and logistics quality with more reasonable layout schemes. This method is conducive to applying advanced digital technology to the daily management of rail transit engineering construction, providing reference and guidance for similar projects, and promoting the digital transformation of the construction industry.