大渡河自北向南流经泸定县,至城关时落差增大,势如脱缰野马,水急浪大,吼声雷动,形成一道难以逾越的天险。尤其洪水季节,寻常渡船不堪一击,当地人渡河只得借助藤葛结索,或溜或荡,如演杂技,难度大不说,且充满凶险,因而世世代代都在盼桥。这种愿望直到十八世纪初才得以实现。大渡河以西,古为藏、羌、彝等少数民族繁衍生息之地,据《后汉书·西羌传》记载,其子孙分支百五十种,“所居无常,依随水草,地少五谷,以产牧为业”。尽管早 Dadu River flow from north to south through Luding County, to the city when the gap increases, the situation like a runaway horse, water waves, roaring thunder, forming an insurmountable natural insurance. In particular, the flood season, the unusual ferry can not withstand a blow, the locals crossing the river had to rely on rattan Ge knot, or slip or swing, such as performing acrobatics, difficult to say, and full of danger, and therefore are waiting for generations from generation to generation. This desire was not realized until the early eighteenth century. To the west of the Dadu River is the place where the ethnic minorities such as Tibet, Qiang and Yi flourished. According to the records of “Post-Han Dynasty and Western Qiang Chuan”, their descendants belong to 150 species, Grain, to produce livestock for the industry. " Although early