When the Han people give their male elders birthdays, they are all birthday girls with long crutches and white beards. If a woman is the birthday girl, she will be offered as a sacrifice to "Ma Gu Tu". Therefore, there is a legend among the Han people that Magu is the birthday girl. In The Legend of Immortals, Ma Gu said that she and another immortal king "haven't seen each other for more than 500 years", which shows the length of their birthdays. And she also said: "I have seen three mulberry fields in the East China Sea, and the water is shallower than before." In the world, she has seen changes from the sea to the mulberry field for at least tens of thousands of years, which shows that she can almost coexist with heaven and earth.

Magu is not immortal, but self-cultivation. Legend has it that the place where she practices is called "Danxia Wanling Cave in Macheng Mountain", which is the 28th cave of the 36th cave of Taoism and the 10th blessed place of the 72nd blessed land. Yan Zhenqing, a famous calligrapher in the Tang Dynasty, wrote the famous inscription "The Story of the Fairy Altar of Magu" when he was a secretariat in Fuzhou, Jiangxi. Near the ghost town of Fengdu, there are also places where Ma Gu once practiced or lived, such as Xian'gu Rock and Ma Gu Cave.

Magu is famous because it is said that she once offered birthday wine to the Queen Mother. Legend of the Immortal also records that Ma Gu threw rice into cinnabar, and Lu said that she was "born with Taoism and could perform on water." .