There are Governor Vessel(督脈), Conception Vessel(任脈), Thoroughfare Vessel(衝脈), Belt Vessel(帶脈), YIN Heel Vessel(陰蹻脈), Yang Heel Vessel(陽蹻脈), Yin Link Vessel(陰維脈) and Yang Link Vessel(陽維脈) in the category of the Eight Extra Channels. They keep the equilibrium state by controlling the unbalance between qi and blood(氣血), Yin and Yang(陰陽), and irrigate the Twelve Regular meridians(十二經脈). They are independent of the Twelve Regular meridians(channels) in running(流注), and, therefore, have their own running, and symptoms of disease. We have bibliographically studied the running, cross points, and symptoms of the Eight Extra meridians, and described the results as figures. By this study, we could confirm that the Eight Extra meridians have their own running, and symptoms of disease. We'll have to study further the application of this conclusion and the correlation between the Extra meridians(奇經) and the Regular meridians(正經).