Li Yu, a famous drama theorist and writer in Qing Dynasty, whose famous masterpiece "Random Thoughts" can be described as an encyclopedia of life, which is quite rich in content and touches all fields of China's ancient life, and has strong entertainment and use value. Li Yu is an ancient scholar who pays great attention to the art and quality of life. He has a lot of research in health care, especially in nourishing the heart. In the "Support Department" of his book "Essays", there are many incisive and original expositions on mental health. He believes that life is limited and short, so people should be optimistic and live happily in the world. He said, whether rich or poor, whether spring, summer, autumn and winter, whether sleeping, sitting, walking, standing, drinking and talking can be fun. As for happiness and unhappiness, it's all in my heart. He said: "If you are happy outside, you will be happy inside, happy inside and happy everywhere;" If the heart thinks it is bitter, it will never stop. "This sentence means that as long as you can treat life optimistically, everything is happy and there is heaven everywhere; If you look at life pessimistically, there is an ocean of suffering everywhere. When talking about the "law of pleasure", Li Yu said: "If you think less of yourself, you will see more coke; If you think of yourself better than yourself, you will feel worried. "That is to say, compare yourself with people who are in a worse situation than yourself, and you will feel happy every day; If you compare yourself with those who have a better life than yourself, you will always be worried. Li Yu called this a "step back" regimen, that is, a psychological regimen. Compared with people who are not as good as themselves, psychology is naturally easy to balance; Compared with people who live better than themselves, they will be more angry and discouraged, and a bad mood will arise. How can there be happiness in life? In order to further illustrate the "step back" health care law, that is, the mental health care law, Li Yu gave an example: a rich man traveled outside and stayed in a hotel for the night. It's midsummer now, and there are many mosquitoes in the bed tent, so I can't drive them away. Thinking about the comfortable life at home in the past, I was very upset and couldn't sleep all night. At that time, I slept under the steps for a pavilion. In order to avoid mosquito bites, he had to get up and run around the yard, humming a tune to drive away mosquitoes for fun. The rich man couldn't understand this, so he asked the curator, "Your situation is much worse than mine. I feel very distressed, but you are so happy. Why? Pavilion director said: "Without comparison, there would be no happiness today." I think that when I was framed and imprisoned, my hands and feet were tied, and there were many more mosquitoes than today, it was really painful. Think about today, I can drive away mosquitoes freely, how can I be unhappy? When the rich man heard these words, he suddenly realized that all his troubles and pains had disappeared. By analogy, the so-called retrograders have no land and no one. If you want to regress, you must be happy. Li Yu believes that this method of mental health is suitable for anyone, no matter when and where. Li Yu's spiritual health care contains profound philosophy of life, which is also of reference significance to modern people's health care.