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This book truly restores the remaining Beijing city walls and gates in the 1920s. Through field visits and investigations, the author was impressed by the magnificence of these magnificent monuments, and also sighed at their current state of decline. In addition to investing the romance and feelings of an art historian in his descriptions, Xi Renlong also adheres to rigorous research methods: digging out the complicated records of city walls and gates in Chinese historical documents, surveying and measuring the dimensions of each section of the city wall and each tower, and observing and recording The current status of the city walls, city gates and surrounding streets and countryside, real-life photos of the city walls and gates, and detailed architectural details of the city gates from various angles make this investigation note reach a very high level in terms of literature, science, and history.