The minor skeletal variations are very common on the supraorbital margin, and theirnomenclature still remains a problem. In this study, we adopted the term of supraorbltal and m.dialfrontal incisura or foramen as well as major incisura. We observed 190 cases (118 males. 72females) or unearted modern Chinese adult crania in Xi’an region, and obtained 6 types. Their incisurae were round more than foramina, and the difference of side and sex was analysed. The frequencies or the supraorbital and medial frontal incisura or foramen, and the Percentage of the ratiobetween the number of foramina and incisurae were compared respectively with those of population inother regions. For the first time, the percentage which was also termed supraorbltal and medialfrontal foramen-incisura index was put forwaed. It is or a better statistical value for race and population studies. The minor skeletal variations are very common on the supraorbital margin, and theirnomenclature still remains a problem. In this study, we adopted the term of supraorbltal and m.dialfrontal incisura or foramen as well as major incisura. We observed 190 cases (118 males. 72females) or unearted modern Chinese adult crania in Xi’an region, and obtained 6 types. Their frequencies are than more than than foramina, and the difference of side and sex was analysed. The frequencies or the supraorbital and medial frontal incisura or foramen, and The Percentage of the ratiobetween the number of foramina and incisurae were compared respectively with those of population inother regions. For the first time, the percentage which was also termed supraorbltal and medialfrontal foramen-incisura index was put forwaed. It is or a better For race and population studies.