Origin
Zhang Guolao (张果老, "Old Man Zhang Guo") is the most eccentric and mysterious of the Eight Immortals. Historical sources place him during the Tang dynasty, where he was reportedly summoned to court by Empress Wu Zetian and later Emperor Xuanzong. He refused both invitations — or appeared, then vanished. He claimed to have been born in the age of the legendary Emperor Yao, thousands of years earlier.
He is always depicted riding a white donkey — backwards. This is not a joke but a teaching: the old man faces the past while moving into the future. He sees where he has been, not where he is going. This represents the Taoist understanding that wisdom comes from reflection, not forward-planning.
身世
张果老（张果老）是八仙中最古怪、最神秘的一位。史料记载他活动于唐代，武则天和玄宗皇帝先后召见他。他两次拒绝——或现身即消失。他自称生于传说中的帝尧时代，距当时已有数千年。
他总是倒骑白驴——倒骑。这不是玩笑而是教导：老人面朝过去而行向未来。他看的是来路，而非去路。这代表道教对智慧的理解：智慧来自反思，而非计划。
Sacred Artifacts
法器
Fish-Drum & Paper Donkey
Zhang Guolao carries two magical items: a bamboo fish-drum (鱼鼓筒) whose rhythm can predict the future and reveal hidden truths; and a paper donkey that, when folded, becomes a real white donkey capable of traveling a thousand miles in a day. At journey's end, the donkey folds back into paper and is tucked into his sleeve.
渔鼓筒与纸驴
张果老有两件法器：竹制渔鼓筒（鱼鼓筒），其节奏能预知未来、揭示隐藏的真相；还有一头纸驴，折叠时是纸，展开即成真驴，日行千里。到达目的地后，驴又折回纸片，收入袖中。
Legends
传说
The Emperor's Test
Emperor Xuanzong of Tang sent a beautiful maiden to tempt Zhang Guolao. The maiden died from his spiritual power when she touched him. He then revived her with a magic potion — but the emperor, terrified of his power, let him go back to his mountains.
玄宗试仙
唐玄宗派美女试探张果老。美女触碰他后，因其仙力而亡。他用仙药将其复活——但玄宗皇帝惧其神通，放他回山。
The Melon Seeds
Zhang Guolao was once seen planting melon seeds in the snow. The watching villagers laughed — melons can't grow in winter. But by morning, the seeds had produced fully ripe melons. The lesson: nature obeys the Dao, not the calendar.
雪中种瓜
人们曾见张果老在雪中种瓜籽。围观的村民嘲笑——冬天怎能长瓜？但到了清晨，种子已长出熟透的瓜。教训是：自然服从道，而非历法。
Legacy
Zhang Guolao represents the archetype of the "holy fool" — someone whose wisdom is so deep it appears foolish to the uninitiated. He is patron of the elderly, of those who feel out of step with the times, and of everyone who has been laughed at for seeing the world differently.
影响
张果老代表"圣愚"的原型——智慧深到在凡人看来像愚蠢的人。他是老人的守护者，不合时宜者的守护者，以及所有因以不同方式看世界而被嘲笑的人的守护者。