Abstract: For the issue of a large number of composite material stiffened walls used in aircraft being praticularly sensitive on impact damage, the shear tests were performed on composite material stiffened walls containing impact damage, and the effect of different damage locations (visual measured damage) on large size composite material stiffened walls were studied. The results show that when the damage was between two stiffened wall, the further to the stiffened wall, the lower the shear carrying capacity. The destructive load was about 48% of the intact stiffened wall after the skin center was impacted at lower energy, and the destructibe damage load was about 84% of the intact stiffened wall when the damage was in the center of the ribs.