In view of the construction of cast in-situ piles under the environment of deep water and rock foundation，the lack of overburden soil leads to the difficulty in the placement of auxiliary steel pipe pile of overwater construction platform and steel casing of cast in-situ piles.Taking the construction of a high pile wharf as an example，this paper studies the construction technology practice and proposes the solution of hole-drilling and pile-inserting.The study results show that：1)To solve the problem of building overwater construction platforms，new technologies can be used，such as punching holes on the platform and vortically drilling holes on the vessel，so as to drill holes before pile inserting for auxiliary steel pipe pile in advance and analyze the characteristics of each technology，applicability，effectiveness，and economy.2)The embedding problem of steel casing is solved by the technology of vortically drilling holes on the platform before inserting.This technology well solves the problem regarding the embedded length of the pile and ensures the quality of the cast in-situ pile.It can serve as a reference for similar projects.