After more than a year's hard work, he wrote the first draft of the world's first monograph on tea science, Tea Classic. This year, Lu Yu was 28 years old. Lu Yu talked a lot about making tea with water in the Book of Tea. The source, temperature and usage of water are regarded as the criteria for making tea by later generations.
He chose water on the basis of "landscape, river times and well water". The Book of Tea written by Lu Yu is regarded as a classic of China tea culture. With the development and spread of tea culture, Lu Yu's contribution is increasingly recognized by China and the world.