Abstract: To study the relation between the age and the changes in skull suture of Chinese for the purpose of the estimation of age by the skull, 139 male Chinese skulls were investigated. The age of the skulls ranges from 15 to 84 years. The study was made on nine sutures of the external and internal plate of the skulls, namely: sagittal, coronary, lambdoid, sphenofrontal, sphenoparietal, sphenosquamous, occipitomastaid, parietomastaid and squamous suture. The results obtained are as follows:
1. The skull external plate suture
a. Between 15 and 19 ages, the degree1 of fusion begins to be observed at sphenofrontal suture.
b. Between 20 and 29 ages, the degree 1 of the fusion at coronary suture accounts for more than 47% of all cases of this group.
c. Between 30 and 39 ages, the degree 2 to 4 of the fusion begins to be observed at sagittal and lambdoid suture.
d. Between 40 and 49 ages, the degree 1 to 3 of the fusion begins to be observed at sphenofrontal, sphenoparietal and occipitomastoid suture. The percentage of degree 4 of the fusion at sagittal, coronary and lambdoid suture, is 10%, 6%, 9%, respectively.
e. Between 50 and 59 ages, the degree 1 to 3 of the fusion begins to be observed at sphenosquamous and occipitomastoid suture. The percentage of degree 4 of the fusion at sagittal, coronary, lambdoid, sphenofrontal and sphenoparietal suture, is 10.5% ,15% ,15% ,30% ,25%, respectively.
f. Between 60 and 69 ages, the percentage of degree 4 of the fusion at sagittal, coronary, lambdoid, sphenofrontal, sphenoparietal, sphenosquamous and occipitomastoid suture, is 16%, 17.5 % ,10% ,38% ,34% ,4%,17.5%，respectively.
g. Between 70 and 84 ages, the percentage of degree 4 of the fusion at sagittal, coronary, lambdoid, sphenofrontal, sphenofrontal and occitomastoid suture, is 50 %,41%,17% ,50%, 8.5 % ,respectively.
h. The relation between the skull external plate suture fusion degree and age was shown in table 3.
2. The skull internal plate suture
a. Between 15 and 19 ages, the degree 1 of the fusion begins to be observed at sphenofrontal suture.
b. Between 20 and 29 ages, the degree 1 of the fusion at coronary suture accounts for more than 32% of all cases of all cases of this group.
c. Between 30 and 39 ages, the degree 2 to 4 of the fusion begins to be observed at coronary suture.
d. Between 40 and 49 ages, the degree 1 to 3 of the fusion begins to be observed at sphenosquamous, occipitomastoid and parietomastoid suture, The percentage of degree 4 of the fusion at sagittal, coronary, lambdoid, sphenofrontal and sphenoparietal suture, is 19.5%, 55%, 16%, 42%, 18.5%, respectively.
e. Between 50 and 59 ages, the percentage of the degree 4 of the fusion at sagittal, coronary, lambdoid, sphenofrontal and sphenoparietal suture, is 40%, 85%, 35%, 45%, 25 %, respectively.
f. Between 60 and 69 ages, the percentage of degree 4 of the fusion at sagittal, coronary, lambdoid, sphenofrontal, aphenoparietal, sphenosquamous, occipitomastoid and parietomastoid suture, is 60% ,96% ,56.5% ,60.5% ,26.5% ,10% ,20%,10%, respectively.
g Between 70 and 84 ages, the degree 3 of the fusion at sphenoparietal and sphenosquamous suture is not found. The percentage of degree 4 of the fusion at sagittal, coronary, lambdoid, sphenofrontal, sphenoparietal, sphenosquamous, occipitomastoid, parietomastoid squamous, is 69%,100% ,58 % ,66% ,41% ,15.5% ,31%,15.5%,7%, respectively.
h. The relation between the skull internal plate suture fusion degree and age was shown in table 4.

Key words: Skull suture fusing degree; Age estimation; Chinese