The model of 2219 aluminum alloy storage tank under two manufacturing modes of rocket storage tank， multi-segment and long segment， is established by finite element simulation. The accuracy of the model is verified by the test plate friction stir welding experiment， and the difference of residual stress between the two is compared. The results show that the stress concentration occurs at the weld in both the multi-segment and the long segment， and the stress concentration at the end of the last weld in the multi-segment is particularly serious. The stress concentration is not obvious at the junction of the longitudinal and girth welds in the multi-segment and the long segment. After the completion of the second girth weld， the stress in the multi-segment is slightly relieved， decreasing by 5.51%， and that in the long segment decreasing by 3.83%. The stress distribution in the parts of the cylinder without weld is more uniform. The longitudinal and circumferential weld residual stress distributions are similar between the multi-segment and the long segment， but the stress concentration area of the long segment is small， the maximum residual tensile stress and the maximum residual compressive stress are reduced by 25.73% and 27.38%.