In single-point progressive forming, problems such as cracking are prone to occur due to uneven thickness. In this paper, the single-point progressive forming technology assisted by static pressure support is adopted. Firstly, the principle of single-point incremental forming with static pressure support is analyzed, and the work piece area is divided according to the thinning rate. Secondly, the variation of the thickness reduction rate in each work piece area under different static pressure conditions is studied through finite element simulation. The research found that the thinning rates in Zone I and Zone III remained at around ±3%, while Zone II was the main deformation area. Its thinning rate fluctuated at 105 mm, dropping from +25% to −35%, and local instability of the material might occur. The thinning rate of the end path resumed positive growth and reached 20% at 150 mm.