ABSTRACT :Objective: The purpose of this study is to analyze the influence of different backpack types and loads on the kinematics and plantar pressure of college students when they walk upstairs. The results of the study are helpful to provide reference for choosing the appropriate knapsack and carrying mode. Methods: The infrared light point motion capture system (Nokov) and plantar pressure system (Podomed) were used to analyze the differences between the range of motion of the trunk and lower limb joints, the kinematic parameters at the peak time, the peak pressure of each plantar partition, the contact time, the maximum pressure of the whole foot, the average pressure and the maximum contact area of 15 male college students during the support period of the stairs. Results: 5% and 10%BW backpack loads reduced the range of rotation of the trunk, increased the range of ankle flexion and extension and rotation, 10%BW backpack loads increased the peak pressure of the first and third metatarsals of the plantar and the maximum pressure of the whole foot (P＜0.05). Single shoulder bag and handbag reduced the range of torso roll and rotation activities, and increased the range of ankle flexion and extension activities, hip flexion angle, foot arch and medial heel pressure peak (P＜0.05). The shoulder bag increased the peak pressure in the toe area (P＜0.05).Conclusion: When walking on the stairs, 5% and 10%BW backpack loads limited trunk rotation and increased ankle activity. 10%BW loads also increased the load in the metatarsal area. The unilateral weight-bearing mode would make the trunk tilt to the unload side and rotate to the weight-bearing side. Toe pressure was higher when carrying double shoulder bag, while single shoulder bag and handbag mainly increased arch and heel medial pressure. It is suggested that college students choose symmetrical backpack scheme and avoid the injury of foot area caused by heavy backpack.