The pre-stress technology adopted by the office building help to increase 10-15% "degree of freedom" in the three-dimensional space (based on 4-5m storey height) compared with the non-pre-stress structure. The standard storey height of the building is 4.05m, and the top storey is as high as 6m. 50~150mm network floor is reserved to build on stilts. The net height of the office room is 3m. Compared with the same building, the construction room of Beijing Wanda Plaza Southern Area has more tolerance, more flexibility and freer selectivity.