Objective To explore the effects of the bottom lock structure on the carrying capacity of the folding carton. Methods Three commonly used bottom lock structures ( sockets style, 1-2-3 bottom lock structure, bottom self-locking structure) were selected for compression test and drop test. Results The socket-type bottom of the box was damaged when the instrument displayed a peak of 31. 2 N during the compression test; the tensile testing machine could not destroy the latter two lock bottom structures. In the drop test, the weight of code was 180 g when the 1-2-3 bottom lock structure was damaged, and the number was 205 g when the bottom self-locking structure was damaged. Conclusion The comprehensive comparison showed that, compared to socket style, the bottom self-locking structure and the 1-2-3 bottom lock structure had obvious advantages in carrying capacity, and the bottom self-locking structure had the best performance. And an appropriate locking style could improve the capacity of sockets style.