Due to the insufficient water depth,high wave and limitation of construction equipment,it is difficult to implement conventional methods such as mechanical pile-pulling and underwater pile-cutting by divers in the removal process of the steel tube pile for temporary steel trestle.Based on an overseas project,we study the new construction method of underwater steel tube pile cutting in-pile body.By laying steel casing outside the steel tube pile,we set up a construction platform,and use the construction method of cutting the steel tube pile inside at the mud surface elevation through remote control of the cutting gun system,and effectively remove the steel tube pile.At the same time,we obtain the construction quota through studying and analyzing the resource usage of labor,materials,construction equipment required by the construction method.