Taking the construction of an occlusive pile in Suzhou as the example, the paper introduces the application of drilling occlusive pile with full casing in foundation pit support engineering for adjacent subway and the main points of construction technology. The results show that the drilling occlusive pile with full casing has advantages of little influence on environment, small disturbance to the ground, rapid construction and low cost, which has a broad application prospect for foundation pit support engineering in soft soil and high water level ground of Suzhou.