Soil displacement screw pile (SDS) has been developed on the basis of CFG foundation treatment technology and by the bit improvement, which can reduce the volume of excavated earth and give full play to the bearing capacity of soil between piles to further cut the amount of concrete. The paper first illustrates its working principle of the key structure of the device; then compares the completed project example with traditional process to prove the technical and economic advantages of SDS technology and finally aiming at the produced problems in the process of construction, analyzes the causes and puts forward the treatment measures.