How to find

First, find L5. The next palpable structure in an inferior direction is the most superior sacral spinous process. Palpate in an inferior direction for three further sacral processes and locate the 4th sacral foramen in a depression less than 1 cun lateral to the 4th process. BL-30 is located on the level of the 4th foramen, 1.5 cun lateral to the midline.Located on the same level are BL 34 (Lower Foramen) (over the 4th sacral fora- men) and BL 54 (Order’s Limit) (3 cun lateral to the midline).


1.5 cun lateral to the posterior midline, on the level of the 4th sacral foramen.


  • Strengthens the lower back and the knees
  • Eliminates Damp-Heat from the Lower Heater
  • Regulates menstruation