In recent years, with the acceleration of urbanization, the renewal of Guangzhou's historic urban areas faces many challenges of development. The contradiction between traditional urban planning and the needs of modern development has become increasingly prominent, especially at the intersection of historical and cultural protection and urban renewal. How to maintain the characteristics of historic urban areas and the convenience of users' lives while improving the functionality and aesthetics of public spaces has become an urgent problem to be solved. Inspired by Kon Wajiro’s Modernology, this research takes the informal renovation in the middle section of Yudai Mout as the research objects of public interfaces renovation, trying to grasp the clues of users' lives, and with the analysis method of "seeing the big from the small", discover the spatial practice and place identity behind the users' life, so as to explore the path and method of informal renovation of public space interfaces in Guangzhou's historic urban areas.