Abstract: According to the basic principle of subgrade construction and the practical construction experience of the subgrade engineering of the South Rapid ground Auxiliary Road of Qingdao New Airport, the construction technology of the upper subgrade under the condition of high-speed rail and subway parallel shallow burying is put forward. Through engineering practice, it is shown that through reasonable selection of subgrade fi ller, compaction equipment and method, it can effectively avoid the problems of disturbance to existing railway line caused by the construction of upper subgrade under the condition of guaranteeing the quality of subgrade fi lling. This construction technology can provide a reference for the subsequent construction of similar projects.