The 19th National Congress of the Communist Party of China made a major political judgment that socialism with Chinese characteristics has entered a new era. Socialism with Chinese characteristics has entered a new era, which is of great significance in the history of the development of the Peoples Republic of China, the history of the development of the Chinese nation, the history of the development of socialism in the world, and the history of the development of human society. Guided by the thought of socialism with Chinese characteristics in the new era, this book interprets socialism with Chinese characteristics enters a new era in a multi-faceted and multi-level manner, and deeply answers why new ideas in the new era can radiate such strong vitality and appeal.