Taking T3 Terminal of Pudong Airport as an example, the excavating method at the front end of soil transporting pipeline in the water flushing test area before the excavation of foundation pit for T3 Terminal of Pudong Airport is introduced, and the mud separation technology in the terminal enclosing area of soil transporting pipeline is studied. Firstly, the total amount of excavation of the deep foundation pit of Pudong Airport is calculated, and the corresponding construction schedule is arranged. Secondly, three soil transporting methods of vehicle, conveyor belt and water flushing pipeline are compared, and various combinations of traditional mechanical excavation and water-flushing excavation are studied. Finally, the manufacturing method of the terminal mud reservoir is introduced, and the mud separation technology and soil sedimentation technology are discussed.