According to legend, Huangdi Xuanyuan Huangdi successfully cultivated in Huangtai behind Laojun Mountain, and rose in Dinghu Lake in Lapras during the day. Later generations built temples and altars on this mountain to worship the Yellow Emperor. This mountain is also called "Tian She Mountain". It is also said that after spending Yin Xi in Qingyang Temple (now Qingyang Palace) in Shu, Lao Zi retired, and the green cow he rode became a green mountain, which is the Woniu Mountain in front of Laojun Mountain. The 69th edition of "Historical Evolution of Laozi" in Taoist Collection says: "In April of the 17th year of Tang Kaiyuan (730), the old gentleman of Taishang evolved in this mountain." Therefore, later generations also called this mountain "Laojun Mountain". Now there is a couplet in Laojun Cave, which says, "Cows control the customs, and there is no hiding place for 102 rivers and mountains;" Can Cong came to Shu Road and 5,000 words were handed down. "

During the reign of Emperor Shundi of Han Dynasty, Zhang Daoling founded Wudou Mi Dao (Shitiandao) after he realized Taoism in Hemingshan (now Tong) in Dayi. In the second year of Han 'an (143), Zhang Daoling established the fourth law of "Eight Governance of Domestic Products" in Laojun Mountain. Legend has it that the Yellow Emperor often eats a kind of fairy grass rich in Laojun Mountain, which is helpful for cultivation. It's called Shencao and Caozhi. Later, the old gentleman saw the sky at night and named it thick japonica grass. Zhang Daoling is named after this grass, which is called "thick japonica rice treatment", so Laojun Mountain is also called "thick japonica rice mountain". According to legend, before building thick japonica rice therapy in Laojun Mountain, Zhang Daoling practiced the method of nine truths here, lectured on exorcism, and hung up flags and banners to pray for the people.