Architectural Evolution of Stupas in the Western Regions During the Han and Tang Dynasties

The Western Regions during the Han and Tang Dynasties served as a significant cultural intersection along the Silk Road, with stupas acting as core architectural forms of Buddhist dissemination, embodying religious, cultural, and artistic evolution. This study is a research article based on typological analysis, integrating historical documents and archaeological site data to explore the stylistic evolution of stupa architecture in the Western Regions during the Han and Tang Dynasties, revealing the changes in religious beliefs and the process of cultural adaptation and integration of Buddhism in a multicultural context. The study demonstrates that the distribution of stupas shifted from being concentrated in areas such as Shanshan and Shule during the Han Dynasty to expanding across a wider region during the Wei, Jin, and Northern and Southern Dynasties, eventually forming a Gaochang-centered pattern in the Tang Dynasty. Architectural styles evolved from the simplicity of domed stupas to diversification and then to standardization. The number of niches increased from none to many before decreasing again, while the proportions of the stupa bases gradually increased. This evolution highlights the transition of stupa styles from a singular form to diversification, eventually achieving standardization in the Tang Dynasty. This transformation not only reflects the optimization of the temple layout, gradually shifting from a stupa-centered to a Buddha hall-centered structure, but also illustrates the evolution of stupas from symbols of the Buddha’s tomb to carriers for Buddha statues and ultimately to representations of the Mount Sumeru cosmological concept. This transition also mirrors the shift in Buddhist beliefs, evolving from Theravāda to Mahāyāna Buddhism and then returning to Theravāda practices. This not only facilitated the regionalization of stupa forms and the integration of artistic styles but also provided a significant medium for cultural exchange between China and the West.