A comprehensive frontal cephalometric analysis was developed and its normal values for Chinese adults were established in this study. This analysis includes two parts: width proportional analysis and symmetry analysis. Most linear width values of males were significantly greater than those of females as expected. However, there were no significant sex differentials in the most width ratios. Among these, the ratio Go/Z reached ca. 75%, Mx/Zy ca. 50%, L6/Go ca. 50% and the Mx/Go ca. 66.6% (2/3). Width problems and possible expansion at canine and molar areas could be evaluated through proportional analysis. To determine the locations as well as extents of dentofacial asymmetry is of great clinical value especially in orthodontic treatment. In symmetry analysis, linear differences between both side structures in vertical and horizontal directions could be calculated.