Abstract: [Objective] To study the change of plantar pressure of tailor’s bunion with minimally invasive osteotomy.[Methods] A retrospective analysis was conducted on tailor’s bunion of 37 patients（71 feet）who underwent minimally invasive osteotomy in our hospital from April 2017 to September 2018 and 33 normal subjects（66 feet）were included in this study.The footscan plantar pressure test system was used to measure and analyze the peak force(PF), peak pressure(PP) and peak impulse (PI) which were indicators of patients and subjects from the feet 1st to 5th metatarsal head (M1~M5) and investigated the biomechanical characteristics of tailor’s bunion.[Results]These preoperative dynamic values of PF, PP, and PF were significantly higher than the normal group in M1~M5(P<0.05).The average follow-up time was (14.13±2.02) months. There were no statistically significant differences in PF, PP, and PI of the M1 with tailor’s bunion of patients of before and after surgery (P> 0.05). These postoperative dynamic values of PF, PP, and PF were significantly lower than the preoperative group in M2~M5(P<0.05).There were no significant difference in PF,PP and PI from M1-M5 between the postoperative indicators of patients and the subjects(P>0.05). The preoperative values of PF, PP, and PI were descending orders from M5、M3、M2、M4 to M1. The subjects and postoperative measured values of PF, PP, and PI were descending orders from M2, M3, M1, M4 to M5.There were no statistically significant difference in the weight, height, shoe size, and dynamic measurement of the 5th metatarsal plantar foot (P>0.05),it was a positive correlation between the patient's age and the peak of dynamic pressure.[Conclusion]The tailor’s bunion leads to increase metatarsal head (M5) in weight and move out in trajectory of forefoot.Minimally invasive osteotomy showed that the treatment method can correct a effectively varus deformity in little toe and the resumption of normal weight-bearing foot.The plantar dynamic mechanical measurements can be accurate response to the tailor’s bunion of changes in weight and a reliable assessment of clinical efficacy.