Abstract: Lateral aspect X-ray films were used to study the area of endocranial profile in 104 (male 67, female 37) adults (18-76). The measurments include cranial maximum length(X1), cranial height(X2)，cranial basis length(X3), nasion一inion length(X4), auricular height(X5), sagittal arc(X6) and the area of cranial cavity(Y). X1, X2 and X4 were found to be the significant factors in calculating the area. The multiple correlative coefficient is R=0.62, P<<0.0005. The stepwise regressive equation is then obtained as Y=43.17X1+24.68X2+41.66X4-1865.87(mm2).The equation may be applied to calculate the area of endocranial profile of the adult.

Key words: Area of endocranial profile; Stepwise regressive equation