In order to discover the past, the most paramount factor is to understand the growth and evolutions of ancient human of communities in North-Eastern of Thailand and from stage to another stage they should study all traces of ancient culture. Concerning to this advantage, we would like to raise only four downtowns in Surin to make comment. Although the finding was initiated by Thai experts, we also need to conduct deeper analysis. According to thorough examinations and evaluations on historic causes, what available they are in Surin and other provinces of Thailand and Cambodia today. The notification is not logical because prior to the arrival of the race in the region and prior to the integration of the province into the kingdom of Thailand’s, the territory was the former legitimate-ownership of the Khmer. In this regard, we must pay attention on an interpretation that those prehistoric downtowns were created by Khmer ancestors instead of viewing the achievements as Thailand’s before 13rd century. In this point, we can illustrate that the sources of Mon-Khmer’s downtowns in prehistory scatter in the whole countries of Thailand and Cambodia and also are one of Khmer cultural basis prior to Indianization. Furthermore, as the duo nations we also discovered traces of prehistoric culture in South Vietnam. The most important and oval prehistoric-downtowns in Surin that their absolute structures can be looked down from the sky are at Kay Yai village, Preah Bet village, Slak Day village in provincial town of Surin. According to video file from research, it revealed the traces of Khmer culture dated around 5,000 years ago. It is a key proof that allows us to understand the ways of organizing districts and villages or communities by our Khmer national before the acceptance of influence of Indian culture that made the locations of Krung (Khmer terms) into Borei (Sanskrit terms) by Indian style. In Korat plateau, the Indian culture flourished in the region since early 6th century. The prehistoric sites with oval shapes in Surin province and prehistoric sites in Memot of Kompong Cham province are the same. In conclusion through analysis, we could evaluate the landscape of Krung in Khmer style into Borei(puri) or Pura in Indian’s and then reforms were made the east. It is very fine that the new turning of history made rapid development by Indian infrastructure. Finally, in the complex of the ancient cities some tools made of such polished stone as axes, colored and colorless ceramics and other kinds of appliance.