Abstract: The sex difference of mid-sagittal frontal arc was quantitatively analyzed in present paper. The samples used in this study are dried alult skulls of known sex and known age in thenortheast China. The mid-sagittal frontal arc is expressed with Fourier Series by Fouriet Trans-form. The discriminant function (DF) for sex determination was devised by means of multi-ple stepwise discriminant analysis. As a result, the predictive rate is 90.10%. Blind test on 31known sex skulls showed that the accuracy ra es were 84.21% for 19 males and 82.33% for 12 females. The study indicated that the age and size of skull have no effect on the sex diagnosis.by this method.

Key words: Skull; Sex determination; Discriminant analysis