The internal bracing with two reinforced concrete lines was used in the foundation pit of a new ward building in Henan Province. The monitoring was made on the deep horizontal displacement of foundation pit retaining pile, strut axial force, ground subsidence and the settlement of surrounding buildings, the monitoring results under all the conditions were analyzed to find out the factors affecting the deformation of foundation pit and the regularity under different conditions, some instructive conclusions are obtained, which could be the reference to the similar engineering construction.