During the drilling construction of water supply well in South Sudan, especially loose quicksand layer was encountered; it was difficult for hole drilling by conventional mud protection. This paper briefly explains the basic principle and working procedure of making the simple synchronous rotary shifter level on the water supply well construction site in South Sudan to realize the air drilling with casing and effectively solve the drilling problems in the quicksand. The improvement suggestions are put forward according to the existing problems in the application of this technology.