Abstracts: Objective: To analyze the differences in static balance plantar pressure characteristics between moderate Lenke 3CN female Adolescent idiopathic scoliosis (AIS) patients and healthy adolescents of the same age, and to provide a scientific basis for scoliosis screening, assessment, treatment, and prognosis evaluation. Methods: Adolescents with moderate Lenke 3CN female idiopathic scoliosis were set up as the AIS group, and healthy female adolescents of the same age were set up as the control group, and 30 subjects were selected from each group. The plantar pressure data of the subjects were collected, and the static equilibrium plantar pressure distribution characteristics were comparatively analyzed. Results: 1. Regarding the plantar pressure characteristics, the average pressure (P<0.05) and hindfoot pressure (P<0.05) of the left and right feet in the AIS group were significantly greater than those of the control group, the forefoot pressure was significantly less than that of the control group (P<0.05), and the Symmetry Index (SI) of both feet was significantly greater than that of the control group (P<0.05). The plantar pressure of the left foot in the AIS group was significantly greater than that of the control group in the A3 and A8 regions (P<0.05), and significantly less than that of the control group in the A5, A6 and A7 regions (P<0.05); the plantar pressure of the right foot in the AIS group was significantly greater than that of the control group in the A1 and A8 regions (P<0.05), and significantly less than that of the control group in the A4, A7 and A10 regions (P<0.05); and the plantar pressure in the right foot of the AIS group was significantly less than that of the control group in the A1 and A8 regions (P<0.05). A4, A7 and A10 zones of the right foot were significantly larger than those of the control group (P＜0.05). 2. Regarding the Center of Pressure (COP), the length of the COP trajectory, the ellipse area of the 95% confidence interval, the maximum distance of COP left-right movement (COP-X), and the maximum distance of COP anterior-posterior movement (COP-Y) of the AIS group were significantly larger than those of the control group (P<0.05). Conclusion: There are significant differences in static balance plantar pressure characteristics between moderate Lenke type 3CN female AIS patients and healthy female adolescents of the same age, with foot pressure favoring the side of the lateral convexity, poorer symmetry and stability of the feet, and weaker balance control.