Abstract: With the development of modern construction technology, a large number of new pile foundationconstruction technologies have appeared, the most representative of which is the large diameter long spiral cast-inplace pile. Through this construction method, not only the drilling construction but also the concrete pressure irrigation construction can be carried out, avoiding the cross construction of multiple specialties and equipment, so as to improve the concrete pouring speed and the pile forming quality. This study, combined with actual engineering cases, analyzes the application of large-diameter and long-screw cast-in-place piles in foundation pit support, and at the same time proposes construction quality control measures in order to provide reference value for relevant personnel.