This paper investigates the localization of Composite capitals in Jiangsu during the modern period (1920s-1930s) using a combined formal and social analysis. The study finds common localization patterns across different periods, reflecting the influence of local traditional culture, and unique patterns across different cities in Jiangsu, reflecting regional diversity. The research explores the interplay between formal design characteristics and social, economic, political, and cultural factors influencing the evolution of Composite capital designs.