Abstract: Foot dimensions of 35 children , including 14 obese children and 21 normal-weighted children, were collected by the Infoot 3D scanner. Follow-up checks were conducted after 12 months and 24 months, respectively. Ten foot dimensions were selected to perform statistical analyses between obese and normal-weighted children. Foot morphology changing for both groups in the three-year follow-ups were also investigated. Results showed that the foot dimensions of obese children were significantly larger than those of normal-weighted children at the same age; More differences of foot dimension parameters between obese children and normal-weighted children were found with age increasing; The foot length of children is positively correlated with height, while the foot circumference and the foot width are positively correlated with weight.