Spring the river is containing the rich hydro-electric resources, valley section suits in the construction hydro-junction, the hydro-junction main goal is prevents floods the electricity generation. This article unifies opens the valley terrain geology characteristic, the hydrology characteristic, has carried on the preliminary design to its hydro-junction. The main content opens the valley hydro-junction including the spring river the basic document, the main building design, the key position scheme of arrangement, ground processing as well as the construction leads dams the current and so on the content. In had considered under each kind of factor, the choice second grade - second grade took this key project the dam spool thread, in the dam choice, carries on the good and bad points comparison after each kind of dam, unifies this project the local characteristic, chose the concrete entity gravity dam to take this hydro-junction the dam. Adjusts Hong to calculate uses the quite universal semigraphical method, after has compared three accents Hong plan had determined an appropriate plan, its design flood level is 306.3 meters, the examination flood level 307.1 meters, the definite top of dam elevation is 310.9 meters. This key position main building by keeps off the water building, the drainage building, the electricity generation building, blows off the building to be composed. Passes the charging after to calculate (gravity dam is stable and stress computational procedure) and the stress and stably compares the nucleus, obtains the non- overfall dam the economical section plane, the top of dam width 12.5 meters, the height 125.9 meters; The drainage building uses the table hole overflow the way, the top of dam curve uses the practical WES curve, disappears can the way adopt selects class disappearing energy; The workshop dam section including three flow conditions and installment field sections, after the workshop uses the dam the type; Uses the deep hole achievement to blow off the building, the hole figure selects does not have presses in the dam the sluiceway. Finally constructs the conduction current to select two issues of two section of conduction current methods, an issue by ties the narrow river bed to release the class, two issues release the class by the conduction current bottom hole, opened the valley hydro-junction to the spring river to produce a quite complete design proposal.