The advanced transfer path （ATPA） method is used to study the vibration transfer characteristics of the computer main? frame package from each cushion pad to key components under different vibration levels of random vibration through experiments， the analysis of the vibration contribution of the cushion pad and optimal design of vibration reduction are carried out. The results show that the measured vibration response of the two key components of the computer mainframe is consistent with the synthetic re? sponse of the ATPA method， which verifies the correctness of the ATPA theory for the analysis of the vibration transfer character? istics of the product packaging system； when the area of each cushion pad is the same， the two cushion pads on the same side of the key components of the computer mainframe play a decisive role in its acceleration response， thus being the key cushion pads； the cushion area of the key cushion pad affects the acceleration response PSD peak value and frequency range of the key compo? nents. With the increase of the cushion area， the acceleration response PSD peak value of key components gradually decreases； when the cushioning area of the key cushion pad is more than doubled， the reduction effect of the acceleration response PSD peak value tends to be saturated， the resonance peak becomes smooth， and the vibration response energy is dispersed over a wider fre? quency range. The vibration reduction optimized design keeps the non-key cushion pad unchanged and only increases the cushion ar? ea of the key cushion pad. The research results provide a reference for the vibration reduction design of the product.