The influencing factors on strength of gable top carton were analyzed. The tensile strength, sealing strength, stiffness, stiffness ratio, bursting strength and fat pack of the carton with different board materials and production process were measured. The anti-leakage and fat packs were also carried out. The results showed that high quality paperboard and barrier paperboard cartons with reverse folded edge can improve carton strength and brand image of fresh milk.