Abstract: In the process of research, this article takes Xiamen Metro Line 2 as an example, specifically introduces the shield construction technology of the raised section of the bedrock and the upper soft and lower hard strata of the urban subway, and analyzes and discusses the construction technology of the shield method. Tunneling parameters and precautions for different formations. In this way, by doing a comprehensive geological survey in the early stage of the construction of the project, actively exploring the geological conditions of the project, and planned tool replacement, and reasonable selection of the tunneling parameters, the quality of the civil construction of the project can be effectively guaranteed.