Objective To understand the morphology of supraorbital ridge and toprovide basis for aesthetic surgery. Methods Forehead morphology was examined in 40 adults (20 men and 20 women). By multi-slice helical CT, a computer reconstruction technique was used to produce three dimensional images and 3-D reconstruction data were analyzed quantitatively. Results Ft,-Ft, V N, N-Op, Fb-Sr, Zm-So, Dbr, Pra-N in male were significantly larger than those in female, and V-N, N-Po, Fb-Sr, FA in youth men were significantly smaller than those in old men. Conclusion There is a difference of forehead between male and female. Projection of supraorbital ridge increases with age.