The universe is infinite, and individual life is limited. Only by conforming to the law of life can we delay the passage of life. Gentle way is Lao Zi's way of keeping in good health, caring for the universe, cultivating gentle spirit, and pursuing the way of keeping in good health of "combining rigidity with softness" and "combining rigidity with softness" to make it last forever. This paper takes Laozi's "tenderness" thought as the starting point and refers to various annotations. Under the historical and cultural background, its principle is to govern by doing nothing, which is true and natural; Laozi's "noble and gentle" way of keeping in good health lies in three aspects: moral sentiment, treating people with things and guiding them to be gentle, so that we can understand the way of heaven and earth and have great virtue, so as to do well everything in the world externally and keep in good health according to the way of life internally. Laozi's idea of keeping in good health is of great significance to Huangdi Neijing.
The later works on health care have far-reaching influence, covering the general purpose of health care and even including some reasonable methods and prescriptions. Laozi's "noble and soft" health care thought has a profound understanding of life, conforms to medical principles, can guide health care and is helpful to clinic. Nowadays, many health preserving theories are popular, but they excessively pursue physical strength and ignore internal qi and softness. Laozi's "noble and soft" health care thought can just make up for this deviation.