Kidney qi can reach bladder from meridians and vessels, bladder qi can reach kidney from meridians and vessels and transfers from little toe and collaterals of Dazhong (KI 4) and Feiyang (BL 58) acupoints along bladder meridian to kidney meridian then forms circulation. Divergent collateral of kidney meridian is distributed over neck and connects bladder meridian then forms circulation route from feet to head and is distributed over heart and lung during the circulation.

Function of kidney is uropoiesis and bladder is urine amassment. Kidney qi reaches bladder then bladder has function of qi transformation and micturition. Circulation of two meridians qi keeps normal excretion of urine. Qi of two meridians participates and receives qi of general circulation, kidney meridian receives qi that transfers from pericardium meridian and transfers into bladder meridian then to triple energizer meridian. Qi of general circulation plays role of coordination in kidney qi and bladder qi.