Abstract: Marine soft soil, widely distributed along China′s eastern coastal regions, significantly impacts urban rail transit construction. This study focuses on marine soft soils from 11 cities across five typical regions in China, analyzing their geological origins, particle compositions, mineral components, and microstructures. It summarizes the engineering characteristics such as physical and mechanical properties, creep, and thixotropy. Based on typical engineering case analyses, the research addresses the engineering risks encountered in urban rail transit construction within marine soft soil strata. It offers guidance for the design and construction of rail transit projects in these areas and suggests effective methods for managing and controlling related risks.