Abstract: A lasting in-situ monitoring was done to investigate the design of the supporting system for a very deep foundation pit in Shenyang. The results showed that the design applying an anchor pile system to the foundation pit is feasible on the whole, though the anchor piles are overdeformed somewhat, thus resulting in insufficient safty factors. Taking appropriate measures is therefore necessary to improve the safty of anchor pile supporting system for similar foundation projects. The excavation for a subway tunnel in the vicinity of the foundation pit affects the pit little, so it is negligible in the design of such a supporting system. However, the effects of frost heaving of foundation soil on the stability of foundation pit is innegligible, which is an important factor must be taken into account in winter for the foundation pit projects in Shenyang. The analysis of the monitoring results is available to provide the reference for both the design and construction of very deep foundation pit projects in Shenyang.