Abstract: In order to provide reference information for the selection of foundation treatment methods of the im? mersed tunnel, the construction methods and effects of the immersed tunnel foundation at home and abroad were studied, the advantages and disadvantages of the pre-bedding and post-bedding methods were analyzed in terms of technology, economy, risk, construction period and other aspects based on the characteristics of foundation treatment. The principles of treatment methods for the foundation under different geological and working conditions were proposed in view of the construction environment and structure of immersed tube based on a thorough analysis of engineering cases at home and abroad, and the necessity of developing the dredging equipment was put forward.