In the implementation of engineering projects,it is necessary to focus on engineering costs and environmental protection issues.The water intake pump room,drainage well,and water intake and discharge pipeline in the port and waterway engineering construction mainly adopt the traditional dry construction method of large excavation+cast-in-place,and the underwater construction method of large excavation+sinking pipe.Compared with traditional methods,a new technology of sinking well and underground excavation pipe jacking is adopted,and the current application status,key and difficult points of sinking well and underground excavation pipe jacking are introduced.Taking a LNG(liquefied natural gas) project in Guangdong Province as the background,a comparative analysis is conducted on the working procedure and construction period,quality acceptance standards,engineering costs,environmental protection,construction safety,and other aspects of different construction methods.Through research,it has been found that the use of sinking well and pipe jacking schemes has significant advantages in engineering costs and environmental protection.Practice has proven that the large-sized sinking well and long-distance pipe jacking schemes are well applied in seawater intake and discharge engineering，and can provide reference for similar engineering design and construction.