【Objective】To explore the characteristics of the plantar pressure data of the patients with adolescent idiopathic scoli? osis（AIS）.【Methods】56 AIS patients who were diagnosed from October 2015 to March 2017 in the East branch of the First Affiliat? ed Hospital of Sun Yat-sen University divided into 3 groups，18 cases in spinal lateral bending to right，18 cases in spinal lateral bending to left，20 cases in type S who were thoracolumbar scoliosis. Another 19 healthy persons were as the control group. The left and right foot pressure，half foot pressure and other biomechanical data were compared. The changes of the plantar pressure and the Cobb angle were analyzed with the patients who wore orthopedic insoles.【Results】Compared with the control group，the mean pres? sure of the left foot and the pressure of the left anterior half of the right bending group were less than those of the control group，and the right half foot pressure were greater than those of the control group（P＜0.017）. To the left bending group，the mean pressure ofright anterior half foot were less than those of the control group，and the right rear half foot pressure was greater than that of the con? trol group（P＜0.017）. The pressure of the left anterior half foot of the S type scoliosis group was less than that of the control group. To the right bending group，the left foot average pressure（44.7%±6.0%）was significantly less than the average pressure of right foot （55.4% ± 6.0%）. There was no difference in bilateral plantar pressure of the left bending group，S type group and control group. There was difference with the plantar pressure distribution in patients with only one curve after they wore orthotic insoles，but there was no difference in patients with type S. There was no significant difference in the Cobb angle after the patients wearing the orthot? ic insoles（P = 0.102）.【Conclusions】The right and left foot pressure symmetry of the right bending patients is poor，but the left and right plantar pressure in the patients with type S is symmetrical. The orthotic insole can be used to adjust the plantar pressure distribution in patients with a single curved scoliosis（left or right），but their effect on the patient′s spinal lateral curvature should be further observed.