The entire idea of "Lao Zi" is developed around the central concept of "Dao". However, the seventy-three "Dao" characters in "Lao Zi" have different meanings although the symbol forms are unified. In some places, "Dao" is Refers to the roots of the existence of the world, some places "Tao" refers to a law, some places "Tao" refers to a rule of life, which reflects the unified view of the life of "Tao". The "Tao" in Lao Tzu's "Tao Sheng Yi, Yi Sheng Two, Er Sheng Three, San Sheng Everything" means? ['Ontology of Metaphysics.', 'A law of things.', 'A rule of life.', 'Combination of the law of things and the rules of life.']