Abstract: Abstract：　Objective　To evaluate the tooth-alveolar bone complex morphology of the maxillary posterior region of adult patients with skeletal class II by CBCT, and to analyze whether there is a correlation between the vertical facial type and the alveolar bone morphology of the maxillary posterior region. Methods　the sample consisted of 84 adult patients with skeletal class II who visited Affiliated Stomatological Hospital of Nanjing Medical University from 2015 to 2018. Measure the buccolingual inclination of the first molar and second molar, the thickness and inclination of the alveolar bone, maxillary base width,buccal alveolar bone, arch width, and the sagittal length of alveolar. Results　The first molar and second molar of hyperdivergent group are more buccal inclined,have narrower maxillary base width and the alveolar height is smaller.The sagittal length of alveolar of hyperdivergent group is shorter.Compared with hypodivergent group,hyperdivergent group have more erect alveolar inclination and marrower alveolar bone thickness of palatal root.Arch width and vertical alveolar bone growth have no cerrection with vertical facial type.. Conclusions　There was a correlation between vertical facial type and tooth-alveolar bone complex morphology morphology in the maxillary posterior region of adult patients with skeletal class II,Which remind us of orthodontic tooth movement limit of patient with higher mandibular plane angle.