Longquan sword forging techniques are State-level intangible cultural heritage in China.Longquan sword: Ten famous sword of the five ancient Chinese, the integrity of noble sword. Legend of the Son and by the European rule of two Dajian Shi Gan joint Suozhu. EU go-getters for the rule of the Son and cast sword, scuttling Heights Mountain, the mountain stream discharge, and leads into the Big Dipper swords stove ring out the seven pools, a name of “Seven.” After the sword into overlooking the blade, like climbing a mountain looking down into the abyss, flowing and deep as if the dragon plate lying. Is the name of “ryongyon.” Named sword called “The Seven ryongyon”, referred to ryongyon sword. Tang Dynasty emperor Li Yuan due to avoid the taboo, the “deep” into the word “Quan”, called “Seven Longquan”, referred to Longquan Jian.