The residual stresses in the ring forgings were tested and described using radar charts. The effects of bulging process forming on residual stress and distribution along ciucumference were analyzed. The results show that radar charts can be used to describe effectively the values and distributions of residual stresses along ciucumference for the ring forgings. And the bulging process forming is an effective way to adjust the residual stress and distribution in the ring forgings. For the ring forgins in this paper, residule stresses are compressive stress and in the range of -50~-150MPa. A sharp area exists in each radar chart and is weakened after bulging process forming. The hoop stresses are relaxed much more than the axial stress and especially on the inner and bottom end surface about 24.8% and 20.2%. The distribution uniformity of residul stress is improved except for the bottom end surface.