As one of the most magnificent relics of ancient Chinese culture, the existing Great Wall has a total length of 21,196.18 kilometers. The Great Wall in Beijing is the most important section, stretching across the six districts of Pinggu, Miyun, Huairou, Yanqing, Changping and Mentougou from east to west. Along with 3,000-year history as an ancient city and 800-year history as the capital, the Great Wall has witnessed the growth of the Chinese nation and the historical and cultural development of Beijing. This book introduces the architectural and functional characteristics of the Great Wall as the military defense system of the Central Plains dynasties in the past and tells the historical development track of the Great Wall's birth and gradual expansion over the past several thousand years. It mainly describes the specific status of the wonderful sections of the Great Wall in Beijing, and depicts the magnificent image of the Great Wall as an auspicious dragon winding at the north of Beijing and guarding the capital. In addition to depicting the architectural and natural beauty of the Great Wall, the book touches on the temples, stele inscriptions and other historical remains around the Great Wall, as well as the traditional villages at the foot of the Great Wall and their customs, presenting the cultural deposits and humanity of the Great Wall Cultural Belt.