Tang Huiyao is the core carrier of the institutionalization and systematic solidification of astronomical thought in the Tang Dynasty. Through classification and compilation， it incorporated astronomical knowledge into the national governance knowledge system， highlighting the core idea that astronomy is for governance， and transforming astronomical thought from an individual， empirical， and decentralized form into a standardized knowledge system under the leadership of national will. Its comprehensive records cover the professional division of labor in the astronomical institutions of the Tang Dynasty， the technological innovation of instruments， the precise observation of celestial phenomena， and the changes in calendars. Particularly， it presents the technical ideas of "Da Yan Calendar，" constructing a complete loop of thought， system， practice， and correction. Tang Huiyao laid the foundation of the institutional history analysis paradigm for the traditional Chinese astronomy research， sorted out the historical trace of astronomical cognition and the evolution chain of contemporary innovation， provided a non-western case study of the social embedding of scientific and technological ideas， and promoted the breakthrough in the global science and technology history research from the western-centricism. It is the core textual basis supporting the development of traditional astronomy history research towards wholeness and systematicness.