lung qi can reach large intestine from meridians and vessels and transfers from index finger, branching crevice behind wrist, collaterals of Pianli (LI 6) acupoint along lung meridian into large intestine meridian then to large intestine. Large intestine qi transfers from meridians and vessels into lung and forms circulation. Divergent collateral of lung meridian connects large intestine meridian at neck side and forms circulation route which is from hands to head and is distributed over heart during circulation.

Function of lung qi must keep normal functional activity on condition of purification and descendance. If lung qi loses downward it will appear dyspnea and cough and constipation. Materials that absorbed by small intestine and transfers into large intestine absorb vestigial moisture and nutrient and transfer out of body; if large intestine qi is uneasy to transfer it will appear symptom of heat thirst and phlegm-dryness. Circulation of qi of two meridians keeps purification downward and transfer. Qi of two meridians participate and receive qi of general circulation, lung meridian receives qi which liver meridian transfers and transfers into large intestine meridian then transfers into stomach meridian. Qi of general circulation plays the role of whole coordination in lung qi and large intestine qi.