Abstract: The Huihe Dam Microlithic site is located in Hulun Buir area. The site was discovered in 1975, and an area of 150m2 was excavated in 1996 by Inner Mongolia Institute of Archaeology. Eight stratigraphic layers were identified at the site, and archaeological materials were mainly unearthed from the 4-8 layers. It can be inferred from the excavation that the Huihe Dam site shows close relationship with the Hake Culture on basis of the sediment. More than 4000 stone artifacts were excavated and collected from the site. According to the "hierarchical dynamic typology”, the 2654 pieces of stone artifacts excavated from 6-8 layers were classified into three groups: manufacture, usage and discard, including flakes, blades, cores and various kinds of tools. General features of these artifacts are summarized as follows: 1) Lithic raw materials were dolomite mainly, which were procured locally from riverbeds. 2) Most cores were intentionally prepared, since lots microblade cores in wedge-shape and core trimming flakes were found. 3) In this assemblage, microblade technology was applied, as well as flake technology. Some artifacts similar to geometric microliths remain further analysis. 4) Various tools appeared small size dominantly, and composite tools were found. 5) Most tools were retouched unifically at edges. Bifacial thinning and backed techniques were applied. 6) Several artifacts were modified by grinding technique at edge partially. 7) Broken artifacts were unearthed and dominated by scrapers.

Key words: Microlithic; Huihe Dam Site; Hulun Buir