When li long ji become the emperor of Tang chao, in order to ask zhang guo lao for secret recipe that how to live forever. He had ever failed to ask hang guo lao for being out. Folk say said , if you really want it and try constantly , you will succeed at last. One day, the emperor li long ji went to zhong hill together with numbers of ministers. For the sake of living forever, he put down his status, climbed the hill himself to see zhang guo lao.

Zhang guo lao deeply knew that the emperor did do lots of good thing, and the nation was flourish for sure, so he consent him to going to the palace. Henceforward, the emperor asked zhang guo lao to perform varied of magic. The emperor had been heard that the donkey of zhang guo lao was a supernatural donkey, so he wanted to see it.
Zhang guo lao took a paper folding from his sleeve, open up the paper folding, and then folded the paper a donkey shape, and blow to it, then the paper dropped onto the ground, and become a real white donkey.

 On the emperor’s view, the donkey was as big as a goat. He didn’t understand and ask “How the special use does the donkey do, could you try it?” In order to make him understand and enter the Taoism, he had mine to teach him and said “my donkey looked puniness, but it could run one thousand km at day, eight hundred km at night. Clamed the hill as run on the road. If you didn’t believe, I can try, please wait a moment”. After that, zhang guo lao ride on donkey, and soon disappeared in sight.

But after a smoking time, the “da da” sound could be heard, then zhang guo lao with fresh lichee in hand, laughing and rolling down the donkey, said “Your Majesty，this is the lichee that I have just collect from ling nan, please look at it.” At sight of the lichee, which had some dew on it, the emperor was supervised to say “you are a god man”.

The emperor was very happy, he awarded zhang guo lao as “guang lu da fu”, gave him name called “tong xuan xian sheng”, and marry his daughter with zhang guo lao.