Abstract： The authors discuss and analyze the diagnosis and treatment of dizziness caused by posterior-circulation ischemia based on HUANG Yuanyu's theory of “qi circles in the body，and the earth is the pivot of the other four zang-organs”. The specific connotation of the theory is that there is upbearing and effusion of the wood and fire in the left circle，constraints and downbearing of the metal and water， and mediation by the earth as middle qi. Based on this connotation，the authors analyze the pathogenesis of dizziness caused by posterior-circulation ischemia，and believe that the pathogenesis lie in the followings： first，abnormal ascent and descent between the clear and the turbid due to earth deficiency with dampness encumbrance； second， wood constraint engendering wind because of earth- dampness and watercoldness； third， the lung and metal are not astringed， leading to wind- yang harassing the upper body. Therefore，it is important to recover the normal function of middle- earth，liver，lung and kidney qi，as well as the circulation of qi movement in body by method of running the arbor wheel together so as to such symptoms as dizziness caused by posterior-circulation ischemia.