In order to improve the static and dynamic characteristics of hanging-back box, the effect of different stiffeners distribution modes was researched. Combined with engineering practice of a hanging box with photoelectric load, ANSYS model was set up and eight kinds of suggestions were presented based on the static and modal analysis results. PROE was applied to set up the parametric model, which can achieve models with different distribution forms of stiffeners in a shorter time. ANSYS was applied to analyze the box with different stiffeners, and a compromise evaluation function was presented to help select the best way of strengthening. At last, considering the practical application of the box, the size of stiffeners was changed and a longitudinal stiffener was added. In conclusion, the static maximum displacement of the optimized box reduced from 0.029 mm to 0.013 mm, meeting the accuracy requirement and the fundamental frequency increased from 88 Hz to140 Hz avoiding the vibration frequency points including 80 Hz, 85 Hz and 100 Hz. The box has been used in a photoelectric device.