This is an article about the way of keeping in good health. "Health preservation" is the key to health preservation. Zhuangzi believes that the way to preserve one's health is to conform to nature, forget emotions and not be trapped by foreign objects. The full text is divided into three parts. The first part, "You can spend all your years", is the general outline of the whole article, pointing out that the most important thing in health preservation is "following fate", that is, inheriting the imaginary road in things and adapting to the changes and development of nature. Taking a chef's decomposition of a cow's corpse as a metaphor for people's health preservation, it shows that life should be "based on its nature" and "based on the principles of nature", and only by taking its imaginary "space" can it be "comfortable", thus avoiding the entanglement between right and wrong and contradictions. The rest is the third part, which further explains the attitude of going with the flow, adapting to nature and "keeping pace with the times". The first is the center of Zhuangzi Thought.