Due to the lack of historical records, the actual extent of Cambodian early Theravada Buddhism from the late Angkorian period to the beginning of Early Modern period, which is key to understanding the unique form of Cambodian Theravada Buddhism practiced today, has remained virtually unknown. This paper examines the emergence, formation and expanding distribution of early Theravada Buddhist temples in Cambodia between the late 13th and c. 17th CE through a typological analysis of architectural remains. Initially, morphological analysis took place within the Angkor region, where a variety of Theravada Buddhist remains are concentrated. Composition of temples are recorded, analysed and classified based on the relationship between Buddhist sanctuaries/shrines and “Khoeun Preah Vihear” (Buddhist Terraces). Then, the chronological order of each classification is identified by applying the results of these studies in Angkor regions to Buddhist temples in other regions of Cambodia which date approximately by inscriptions, chronicles, and current field studies. This paper aims to discuss the historical significance of early Theravada Buddhist Monastery in Cambodia from transition of spatial configuration.