Draft, please contact the authors before use A Preliminary Result of the Carbon and Nitrogen Stable Isotope Analysis of Hanben Site Jiun-Yu Liu 1 , Ivy Hui-Yuan Yeh 2 , Yi-Chang Liu 3 , Li-Ying Wang 2 , and Xinyi Liu 4 1 Department of Anthropology, University of Washington 2 Division of Biological Anthropology, Department of Archaeology and Anthropology, University of Cambridge; College of Humanities, Arts and Social Sciences, Nanyang Technological University, Singapore 3 Institute of Archaeology, National Cheng Kung University 4 Department of Anthropology, Washington University in St. Louis Abstract Hanben site is located at the south end of Yilan County in eastern Taiwan. This site is situated on the coastline near the Pacific Ocean, only a few meters from the sea today. According to the current data, the site center is at 24°19’40” north latitude and 121°45’56” East longitude and about 19m above sea level. At least two prehistoric cultural layers in this site. Based on the ceramics and burial practices, the remains from L4 (1,600-1,200BP) could be considered to Shisanhang culture. The remains from L6 (2,000-1,650BP) cannot be identified with any exist prehistoric culture in eastern Taiwan. However, the flexed with sit position burial practice indeed shows some similarity with other prehistoric culture in eastern Taiwan. 20 specimens were taken from the site for collagen isotope analysis. Of the 20 specimens taken from the site, 10 were human, 4 were deer, 1 was pig and 5 were fish. The mean δ 13 C value for humans is -15.1‰, which is 5.8‰ higher than the herbivore (deer) value of -20.9‰. There is an estimated 0–2% increase between trophic levels in δ 13 C, strongly suggesting that herbivores were not the humans’ only food source. Although herbivores were not the only food source of Hanben people, surprisingly in this work, human δ 13 C and δ 15 N values are notably lower than that of fish, which means that fish were also not the dominant dietary staple of Hanben people. The human values are, in fact, intermediate between herbivores and fish. Thus they are likely to have consumed a combination of foodstuffs. The result also indicates millet as one of the diet sources.