Measuring the length of the proportional units (PU) of different truncal parts in males and females and analyzing the relationship between these measurements showed that there was nosignificant gender difference in the length of one cun respectively for the perpendicular proportional units (PPU) of prothorax, epigastrium and flank but there were significant differences in the PPU of the hypogastrium, lateral thorax and hypochondrium and the horizontal proportional unit (HPU) of the back; within the same gender, there was no significant difference in the length ofone cun between the PPU of the prothorax and that of epigastrium and no significant difference betweenthe PPU of the flank and the HPU of the intermammillary region in males but there was a significant difference between PU of other parts.

Measuring the length of the proportional units of the lower limb and analyzing their interrelations showed that between genders there were significant differences in a length of one can of perpendicular proportional unit for various regions of the lower limb; within the same gender, there were different results in comparing the lengths of one of perpendicular proportional unit among various regions of the lower limb.

Fifty-one fresh adult cadavers (male 21, female 30) were randomly selected. The required acupoints were localized and then the cadavers were frozen for anatomical dissection. Distance between the shallow point on the skin and the dangerous zones were measured after the cavaders were unfrozen. Data were analyzed statistically. The results showed that safe needling depths for Fengfu, Yamen, Fengchi and Jingming were 40.08mm, 38.10mm, 39.70mm and 34.25mm, respectively