Books in China are mainly kept by families, libraries, institutions and enterprises, as well as books circulating in society. These data are difficult to count. There are so many countries in the world that it is difficult to count them clearly. However, to say the percentage of China's books in the world, I personally think it can be considered from the development level of a country. Generally speaking, the more developed a country's economy is, the more books it has. Generally speaking, if China's economy ranks first in the world and its book collection ranks first in the world, then we can calculate the percentage of China's book collection in the world. But we can only calculate the proportion, but we can't get the specific quantity.