The work aims to improve the adjustment accuracy of center of gravity for big-airdrop packaging and simplify the adjustment procedures. The position of the center of gravity was firstly determined and then the length of the hanging cable was calculated, and lastly proper counterweight and adjustment were conducted to adjust the center of gravity. Compared with the traditional adjustment method, the optimized method was simpler and more accurate and effective. In conclusion, the method can be widely used in adjusting the center of gravity for big-airdrop packaging.