Archaeological research in East Sumba conducted from 2016 to 2021 has identified five archaeological sites (Lambanapu, Melolo, Kambaniru, Wunga and Mborobakung) that could be linked to the origin of Sumba's ancestors. These sites all acted as locales for burial, with human graves densely scattered in each of the excavation areas. The project demonstrated the application of various burial traditions, including pimary and secondary burial, with or without the use of containers. The five sites are characterized by two chronological periods of cultural development: the neolithic, which then later expanded to paleometalic and megalithic. The results of 14C dating analysis indicates the sites were first used for burial around 3000 years ago. This paper will discuss the new discoveries at the five sites on Sunba and provide new perspectives on the origins of Sumba's ancestors and culture.