Taoism is a religion worshipped by many gods, and there are many immortals. Taoism believes that the cultivation of Taoism has the level of Taoism. Immortals can be divided into five levels according to the level of the cultivation of Dandao in Zhonglu preaching collection, namely, ghost immortals, human immortals, earth immortals, immortals and celestial Immortals. The highest level of the five immortals is "Tianxian". When the practice of Tianxian reaches a certain level, it needs to accumulate morality and do good deeds. Only when the merits and virtues are complete, can it be called Tianxian after receiving the heavenly script and returning to Dongtian.