Abstract: The ultra-thin-wall cylinder, which owned radius of 558 mm and wall thickness of 0.42 mm, was obtained by deeply cold spinning on C-276 nickel-based alloy thin-wall large radius-thickness ratio welded cylinder. The effect of deeply cold spinning on mechanical properties, microstructure and corrosion resistance of matrix and weld seam by tensile test, microstructure observation and corrosion test. The results show that the grains in matrix were refined obviously and the orientation of grains was enhanced after cold spinning reduced by 80%, and the grains in weld seam transformed into small granular grains from coarse and long fishbone dendrite. After cold spinning reduced by 80% and solution annealing at 1 150 ℃, the grains in matrix were similar with those before cold spinning, tensile strength kept invariant and elongation raised by 23.28%. The grains in weld seam were smaller than those in matrix, tensile strength was higher than that of matrix and increased by 10.11% and elongation increased by 43.6%, the corrosion resistance of weld seam and heat affected zone were improved.