Methods: 1000 Tibetan and Han s skull CT images were measured and the index of ratio of width and length(width/length) were analysised with SPSS statistic software.

• 方法:在西藏高原通过对1000例藏汉头颅CT图象的测量,按照颅骨的宽长比值(宽长比值=宽/长),依据SPSS统计软件进行分析研究。