By the engineering case of the theoretical design of retaining pile as tower crane foundation for the first-high building in Anshan-Anshan International Pearl Building, the paper introduced that the retaining pile was constructed not only as the main structure of foundation pit support but also as the carrier of the tower crane. This bold design successfully resolved the difficulty of tower crane installation in many narrow sites. Based on this theoretical calculation, the concentrated loading valuetaking in the foundation pit design would be solved and be transformed into the model to provide reference for similar engineering in future.