Take the "green cow" as the mount of the immortal Taoist priest. Biography of Lao Fei in Historical Records: "So I wrote a book from top to bottom, which talked about morality of more than 5,000 words, and I don't know the end." Sima Yi quoted the words of China, South Korea and Liu Xiang in the Fairy Tale: "I traveled to the west to make the yin see purple, but I rode a green cow." Later, Jin Anshou, who was in the Ming Dynasty, took the "green cow" as the mount of the immortal Taoist priest and got the second discount: "It's best to kill you to drive the green cow, ride the red carp, ride the white deer and ride the yellow crane like this BMW carved saddle."