The full text is divided into three parts. The first part is "You can spend all your years", which is the general outline of the whole article. It is pointed out that the most important thing for health preservation is to "know the classics from the edge", that is, to adhere to the virtual Tao in things and adapt to the changes and development of nature. The second part, How to Keep Healthy, compares people's health with the decomposition of cows' bodies by chefs, explaining that life and life should be "nature-oriented" and "sky-oriented", and only by taking virtual "space" for yourself can we be "comfortable", thus avoiding the entanglement of right and wrong and contradictions. The rest is the third part, which further explains the attitude of "obeying fate, conforming to nature and being safe and smooth". The center of Zhuangzi's thought is, on the one hand, helpless freedom, and on the other hand, opposing letting nature take its course. Although this article talks about health preservation between the lines, it actually reflects the author's philosophy and life purport.