Tamalin Site is located in the Ailan District (li) of Puli Town, Nantou County and is one of the first prehistoric sites discovered in Taiwan. In 2003, the National Museum of Natural Science excavated an area designated for the construction of a new medical care building at Puli Chrisitan Hospital, with an impressive array of results. On the basis of data collected during the excavation, this paper reexamines the dating, period classification and cultural implications of the Tamalin Site. It concludes that the site dates from approximately 4200B.P.-1800B.P. and can be divided into three distinct stages; Niumatou culture, Shuiwaku type and Tamalin type. Of these. it is possible that Shuiwaku type is a later derivation of Niumatou culture and includes cultural elements from Eastern Taiwan. In contrast, Tamalin type is a product of Yingpu culture from the western plains arriving in the Puli basin and mixing with Shuiwaku type.