Longquan sword was built in the Spring and Autumn Period and the Warring States Period, with a history of more than 2,600 years. The story of Ou Yezi casting a sword is widely circulated among the people. Longyuan sword is the original name of Longquan sword. It is said that once Ou Yezi drew water to quench his sword, there suddenly appeared a "five-colored dragon pattern" and a seven-star bucket statue, so people called the place where the sword was cast "Longyuan" and the sword "Longyuan Sword". In the Tang Dynasty, the word "Yuan" was changed to "Quan" to avoid the great-grandfather Li Yuan.

Ou Yezi, the master of sword casting. In Nanxi Village, Longquan City, there is also a temple of General Ou Yezi today, which is dedicated to the statue of this sword-casting master.

Legend has it that Ou Yezi, a native of Minhou, Fujian, is good at casting swords. In order to cast a sword for Gou Jian, he came to Longquan. In the era of cold weapons, sword is one of the decisive weapons on the battlefield, and its quality is very important.

The ancients made swords from meteorites in the sky. Because the iron contained in meteorites is much harder than bronze, this kind of meteorite iron is very rare. Ou Yezi has been looking for an alternative material, iron sand, which has the same performance as meteorites.

It was in Xiqinshan, the land of Ouyue that Ou Yezi found the iron ore he had been looking for. Since then, Xiqinshan has become the base for his sword casting.