Puncture perpendicularly 0.2-0.3 inch.
1. Perpendicular insertion 0.2 to 0.4 cun.
2. Transverse insertion to join with such points as Quanliao S.I.-18, Yingxiang L.I.-20, etc.
3. Oblique insertion supero-laterally, along the infraobital foramen, 0.3 to 0.5 cun.