Results: The length of RCL is 12.3 ± 1.2 mm and those of UCL is 12.2 ± 0.9 mm, shorter than RCL, UCL of western person (12 - 14 mm). Original footprint of RCL is 4 ± 0.8 mm X 4.62 ± 1 mm, similar to research of Carlson (respectively 4.1 ± 0.7 mm, 4.9 ± 1.1 mm).