Abstract: Objective To investigate the clinical normal values of the whole Ricketts analysis about cephalometry of the Han nationality adolescents with normal occlusion in Changchun area and to compare the craniofacial characteristics between males and females. Methods Students in elementary and middle schools of Changchun were extensively surveyed， and 120 adolescents: 61 males， 59 females with normal occlusion were selected. Cephalometrical films were gathered for each subject. The landmarks and cephalometric planes were determined， measurements for Ricketts were carried out with Dolphin 17.0 software. Data from 65 subjects were statistically analyzed by SPSS17.0 software with average±standard deviation. The differences between males and Females were statistically analyzed by t testing. A level of significance of 5% was assigned and P value was determined. Results The clinical normal values of the whole Ricketts analysis about cephalometry of the Han nationality adolescents with normal occlusion in Changchun area were obtained. Ricketts analysis revealed that except for ANPog、FHNA、XiPm、Anterior Cranial Length， there were no statistical differences in other values between male and female subjects (P<0.05). Conclusion The investigation on the clinical normal values of the whole Ricketts analysis about cephalometry of the Han nationality adolescents with normal occlusion in Changchun area can be used to provide guideline for orthodontic diagnosis， treatment planning and prognosis.

Key words: cephalometry, cephalometrical film, Ricketts analysis, normal values