The Middle Ages (about 476 A.D.-A.D. 1640 A.D.) is an era in European history (mainly in Western Europe), from the end of the Western Roman Empire (A.D. 476) to the period when capitalism rose after the British bourgeois revolution (A.D. 1640 A.D.). The word "Middle Ages" was used by humanists in the late15th century. Europe in this period did not have a strong regime to rule. Feudal separatism brought frequent wars, which led to the stagnation of science and technology and productivity, and people lived in hopeless pain. Therefore, the Middle Ages or early Middle Ages are generally called "dark ages" in Europe and America. Traditionally, it is considered as a period of relatively slow development in the history of European civilization. Medieval period is a historical term, which refers to the world history at the end of 5 ~ 15. At that time, the world was divided into regions, mainly based on natural economy, and the world was not integrated. Therefore, the medieval history of the world was expressed in several civilized regions (Western Europe, Roman Catholic civilization, Eastern Europe, Greek Orthodox civilization, West Asia, North Africa, Arab-Islamic civilization, South Asia and Southeast Asia, Buddhism and Hinduism, and East Asia Confucian civilization). The Middle Ages was an era of faith, so Christianity (Catholicism and Orthodox Christianity) and Islam. In the concept of world history, medieval history can also be called medieval history, and the concept of "medieval" in the west came from this. The concept of the general history of the world in the Middle Ages is the history from the demise of the Western Roman Empire in 476 AD to the demise of the Eastern Roman Empire in15th century, while China corresponds to the history from the Southern and Northern Dynasties to the Ming Dynasty.