The paper aims to study the ethical system of architectural art in the Imperial Palace. The Palace Museum is the highest model of palace architectural technology and art in China. Through the investigation of the architectural layout, naming, decoration and other historical materials of the Forbidden Museum, the research results are as follows: (1) the architectural art of the Forbidden Museum fully highlights the values of traditional Chinese ethics.(2) The Palace Museum complex reflects the layout concepts of ancient Chinese palaces, such as "Zuo Zu You She and Qian Chao Hou Shi", bearing the traditional forms of ancient Chinese palaces, and is the concrete presentation of Confucianism and etiquette system.(3) The architectural design of the Palace Museum integrates the essence of traditional culture such as the supremacy of imperial power, the unity of nature and man, and harmony and benevolence. The researchers hope that in the future research, we can understand the architectural art of the Forbidden Museum and the application of this ritual ethics in modern architectural art through the thought of traditional Chinese ritual ethics.