Abstract: Pingan IFC is the highest building under construction in South China at present, whose top floor is 588 m high and spire's is 660 m high, with 5 floors under the ground and 118 floors above the ground. The excavation depth of foundation pit is up to -33.8 m, and the surrounding environment is complex. It is subjected to many nearby buildings and subway tunnel at its north side. Therefore, the design and construction of supports for the foundation pit are difficult. The key technical schemes for the design and construction of the foundation pit are introduced. The double-ring inner-supporting structure is used as the inner support system, and the combination of high-pressure jet grouting pile and grouting with sleeve valve pipe method is used to cut off water. Considering the ring inner-supporting structure, the earth is removed at trestle. As a super-deep foundation pit under complex environment, its design and technical solution may provide reference for similar projects.