〔Abstract〕 Objective To investigate the difference of facial soft tissue changes in patients with different vertical bone facial types after orthodontic treatment.Methods A total of 137 female patients with class Ⅱ malocclusion aged 18 to 30 years old were selected for retrospective analysis using facial soft tissue 3D model data.According to the mandibular plane angle(FH-MP) angle,they were divided into high angle group,average angle group and low angle group.The EinScan Pro 2X 2020 handheld high-precision 3D scanner was used to capture facial soft tissue images of patients before treatment(TO) and at 6 months during treatment(T1) and after treatment(T2).The patients' facial images were overlapped using reverse engineering software Geomagic Wrap 2021,and the differences within and between groups were statistically analyzed using SPSS 26.0 statistical software.Results Before and after orthodontic treatment,the average overall facial changes in the high angle group were(-3.25±0.22)mm,in the average angle group was(-3.28±0.30) mm,and in the average low angle group was(-3.69 ±0.36) mm.Compared with the other two groups,the changes in the low angle group decreased more,and the difference was statistically significant(P<0.05).The mandibular angle area and temporal area decreased the most in the low angle group,which were(-2.78±0.18) mm and(-2.27±0.35) mm,respectively,and the difference was statistically significant compared with the other two groups(P<0.05),while there was no statistically significant difference among the other groups(P>0.05).Conclusion The whole face and all facial regions of the three groups had some negative changes,but the collapse in the mandibular angle area and the temporal muscle area of the low angle group was more obvious than that of the other two groups.