| Banqiao Town Located in the western Hubei Province of Hubei, Chongqing intersection point, geographic coordinate: East longitude 109°15 ' 15 " ~109°22 ' 30 ", north latitude 30°30 ' 35 " ~30°38 ' 10 ". Geology lithological character of the research area is for the Triassic Period Jialing River group with Daye group calcareous rock, moreover distributes widely, the deposit thickness is big. It has formed the quite complete underground river pipeline system of nets - - dragon bridge - Tianshui underground river system in the entire area. It looks like has certain homophyly with the surface river, but also has the essential difference. South the underground river upstream, has the branch big gulf, north the branch three hole systems, both coordinate with each other across a great distance, what is more astounding, It is cross basin capturing, passes through surface watershed between Yangtze River, the Qingjiang basin, its entrance belongs to the watershed slope, generally speaking, the ground water and the surface water should toward the northern side day pit crack and the Yangtze River side counter current, but the dragon bridge underground river actually obstinately cuts to the south puts on 2000 meter watershed main nerves, mufu Grand Canyon in the plank bridge domestic inflow, forms the Qingjiang branch cloud dragon river. This kind captures only then appears in the karst area, because of this kind captures the phenomenon, Long Qiaohe changes the southwest direction, by adapts the Yangtze River system to become adapts the Qingjiang river system. Because of the prosperous day pit crack's existence, it has formed a lower reduced plane, north lets the dam system change the Northeast direction, by adapts the Qingjiang river system to become adapts the Yangtze River system. Therefore, this article studies this area the cavern and the underground river system's origin and the development evolution tendency, not only has the very important scientific value, moreover protects and uses it to be possible to bring the significant economic efficiency to the locality. The present paper take the Banqiao underground cave system as the object of study, through the regional geology acquisition of information and the spot investigation, to studies the area's the physical geography condition, the terrain landform, the formation lithology, geological backgrounds and so on geologic structure and hydrogeological conditions carries on the analysis; And through to describe the area underground cave system characteristic, summarizes this area cavern system's form factor and the evolved rule. The research area is situated at the subtropics, is the monsoon mountainous region humid climate, the rainfall is abundant, in addition this area thick product level and the fold shape Triassic Period Central Bureau of Investigation and Statistics Jialing River group (T2j), under the series Daye group (T1They will exist compete for the water source for a long time between the rivers and the rivers, the river system unceasing vicissitude, will have possibly new round capturing from now on, under this kind of pattern, the entire underground river system will possibly be destructed, will form the new cavern piping system. Therefore, we should be careful of use the land sewer, in the environmental protection, we should strengthen the Dongkou marsh land ecological environment the protection, particularly to the vegetation the protection, guarantee the underground river system normal smooth growth.d) the calcareous rock distribution, has provided the advantageous condition for the cavern and underground river system. The diastrophism stuck out unceasingly the rise, the corrosion reduced plane undercuts unceasingly, causes the dragon cave, the sheatfish cave, the hot cloud cave, chuan dong cave, the black cave to form three caverns which corresponded.
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