Abstract: The statistic analysis of the Sagittal Diameters (SD), transverse diameter (TD) of middlecross section(MCS) of tibia, and the SD, TD of cavitas, and the margoanterior, medialis,laterior, facies medialis, laterior and posterior of substantia compacta was carried in 218 cases(1--94 years old) of Chinese Han nationality. The results showed that there exists a close relationship between the age and the SD, TD of MCS of tibia in 1 to 30 years old group, relativethickness of substantia compacta in 1 to 30 years oldgroup.
The average diameters of covitas in 1 to 25 years old group regularly vary with the in-crease of age.

Key words: Tibia; Cross section; Change of age