目的　观测国人第3~7肋形态学参数，为改进常用固定器械、提高肋骨骨折救治水平提供解剖学依据。  方法   随机收集广州军区广州总医院2013~2014年113例行胸部CT扫描患者资料，行胸廓三维重建并对双侧第3~7肋相关参数行影像学测量。 结果   第3~7肋侧区平均宽度（mm）分别为12.79、13.69、14.47、14.79、15.13， 上缘厚度（mm）分别为5.32、5.28、5.46、5.34、5.45，下缘厚度（mm）分别为5.12、5.37、5.38、5.35、5.37， 前扭转角（°）分别为26.69、26.22、25.70、25.16、24.45， 后扭转角（°）分别为10.25、9.87、10.39、9.46、9.30。各参数性别间差异有统计学意义（P＜0.05)，而各参数年龄差异均无统计学意义（P>0.05)。  结论   应用CT三维重建可对第3~7肋相关参数行影像学测量，可为设计并研制新型解剖型肋骨固定装置提供解剖学依据。

Objective   To observe and measure morphological parameters of rib 3 to 7 among Chinese adults, and provide anatomical basis for modifying fixation skill and improving recovering from rib fracture. Methods    Chest CT data of 113 patients were randomly collected from Sep. 2013 to Feb. 2014 and used to reconstruct three-dimensionally the thorax, followed with the measurement of anatomical parameters of bilateral rib 3~7.    Results    The average width (mm) of lateral area of rib 3~7 were 12.79,13.69,14.47,14.79 and 15.13.The thickness (mm) of upper edge were 5.32, 5.28, 5.46, 5.34 and 5.45. The thickness (mm) of lower edge were 5.12, 5.37, 5.38, 5.35 and 5.37. The anterior twist angle （°） were 26.69, 26.22, 25.70, 25.16 and 24.45. The posterior twist angle（°） were 10.25, 9.87, 10.39, 9.46 and 9.30, respectively. Parameters demonstrated significance statistically between male and females groups（P＜0.05), but no significance among different age groups（P>0.05).    Conclusions    CT reconstruction is valuable for analyzing anatomic features of adult ribs, designing and manufacturing new surgical fixation devices.