According to the application of PC engineering pile for foundation pit support in Wenzhou silty soft soil area, although its construction convenience and construction speed are more prominent, but the lack of theoretical basis for safety, and the excavation displacement and deformation are often large and local collapse engineering accidents in Wenzhou soft soil area. In this paper, the applicability of PC engineering pile is studied through theoretical calculation and computer calculation compared with commonly used drilled pile, and finally, the typical foundation pit cases of Wenzhou actual engineering are compared and analyzed, which provides certain guiding significance and reference value for the support design of PC engineering pile in Wenzhou area in the later period.