The bracing systems of pile and oblique bracing have obvious advantages in big and deep excavation. Because the study about the removal of oblique bracing is rare, the use of this system is limited. This author would study the transfer of internal forces and deformation issues in the process of the exchanging support through an example, from the design and construction, and the result will be verified through the measurement. The study has showed that the removal of such bracing shall tack the coordinating role of space in account, and use the collaborative computing method to remove the diagonal braces in several subregion and sections. And reached some interesting conclusions, these can provide reference for this design and construction.