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目的：测量上海市奉贤区错牙合畸形患者的 Bolton 指数，分析 Bolton 指数在性别、年龄和安氏错牙合分类患者间的差异。方法选取符合条件的上海市奉贤区错牙合畸形患者348例为研究对象，分别按性别、年龄和安氏类型分组，分别比较各组患者模型 Bolton 指数前牙比、全牙比之间的关系。结果上海市奉贤区不同性别组、不同年龄段组间 Bolton 指数差异均无统计学意义（均 P ＞0．05）。安氏三类错牙合畸形患者前牙比分别为（79．88±3．15）％、（78．91±2．86）％、（80．59±1．55）％，前牙比中Ⅰ类与Ⅲ类差异无统计学意义（P ＞0．05），Ⅰ类与Ⅱ类、Ⅱ类与Ⅲ类差异均有统计学意义（P ＝0．024、P ＝0．015）。安氏三类错牙合畸形患者全牙比分别为（79．88±3．15）％、（79．88±3．15）％、（79．88±3．15）％，差异均无统计学意义（均 P ＞0．05）。结论上海市奉贤区 Bolton 指数符合我国制定的标准，性别、年龄不是影响奉贤地区 Bolton 指数的因素， Bolton 指数异常是错牙合畸形的重要影响因素。临床上应特别注意安氏Ⅱ类错牙合的 Bolton 指数分析，结合Ⅱ类错牙合具体分型制定矫治计划。“,”Objective To measure Bolton index with malocclusions in Shanghai Fengxian district,and ana-lyze the distinction among different malocclusions patients in respect of gengder,age,and different Angle classifica-tion.Methods Measure Bolton index of plaster models of 348 eligible malocclusions patients who were selected ran-domly from Shanghai Fengxian District,and divided them into different groups by gender,age and Angle classification. Then,Bolton overall ratio and Bolton anterior ratio among these groups were analyzed and compared.Results The results showed that there were no significant differences of Bolton analysis in respect of gender or age(all P >0.05). It exsisted obvious differences in anterior ratios among the three Angle malocclusion class(P <0.05).Bolton anterior ratios were (79.88 ±3.15)%,(78.91 ±2.86)% and (80.59 ±1.55)%,mean of Class I and mean of ClassⅢwere bigger than that of Class Ⅱ.Bolton overall ratios of Angle class Ⅰ,classⅡ and class Ⅲ were (79.88 ± 3.15)%,(79.88 ±3.15)% and (79.88 ±3.15)%,and there were no obvious differences in overall ratios among them.Conclusion Bolton index with malocclusions for Shanghai Fengxian District accord with normol Bolton index of our country.Gender and age are not the influencing factors of Bolton index in Fengxian District.Bloton index anomalies are the important fator in malocclusions.We should pay more attention to the Bolton analysis of class Ⅱ malocclusions in clinical practice,and draw up a treatment plan combined with specific classification.