In view of the development of society and the increasing demand of readers, China Encyclopedia Dictionary Publishing House has updated many subjects. This edition further highlights two key points of this book, namely, the basic disciplines of culture and science and the disciplines of politics, economy, literature and religion. The lower limit of the basic disciplines of mathematics, physics, chemistry, biology, geography, history and other cultural sciences starts from junior high school, with the middle school curriculum as the main line, and the text is explained from shallow to deep, and the upper limit reaches the forefront of modern science; Politics, economy, literature, religion and other disciplines focus on major events in daily social life and introduce relevant basic knowledge. For example, in international affairs, in order to help readers understand the situation in the Middle East, basic knowledge items reflecting the geography, history and culture of the two river basins have been added. At the same time, the armed forces of some countries and regions that have a significant impact on world security have been increased. Although the armed forces of some of these countries can't help world security, they have their own characteristics, such as Switzerland. In addition, in order to clarify some criticisms about the seventeen years before the founding of the People's Republic of China (1949- 1966), the general line of socialist construction is taken as the main text and comprehensively expounded in 40 articles. In order to ensure the authenticity of this part of the content, all the decrypted minutes of the central meeting and central documents are quoted to reproduce the true face of this history. Geographically, it has increased all counties and nature reserves in China, as well as intangible cultural heritage, material cultural heritage, world cultural heritage and natural heritage. There are many revisions in China's literature, including the branches of popular literature, and some influential items such as ancient prose, raving essays and poems. At the same time, as far as possible, the original text is introduced into many poems and essays, the shorter original text is introduced into the interpretation, and the longer original text with more than 300 words is recorded on the CD attached to the book for readers to retrieve. Some influential novels, such as Peacock Flying Southeast, Pipa, Song of Eternal Sorrow, Fu Qin's Ode, etc. , as a special case, are collected in the interpretation of the text. In addition, there are many supplements to other disciplines such as medicine, astronomy, environmental science, literature, art and religion. More than 5,000 new entries, about 3.5 million words.