The Paleolithic archaeological field work and systematical excavations in Heilongjiang Province started in the 1930s. Thus far, more than 100 sites or localities have been reported or published in different areas of Heilongjiang Province, mainly for the Upper Paleolithic. A new field survey was conducted in Gannan County in 2017 jointly by the Institute of Paleontology and Paleoanthropology, and the Heilongjiang Provincial Archaeology and Cultural Relics Institute. Upper Paleolithic deposits were found in a vast area around Taipinghu Reservoir, along with fine chert resources. One semi-subterranean dwelling was found at the Guanghetun Locality 1. These discoveries indicate large scale human occupations during the Upper Paleolithic period, associated with mature blade and microblade technologies. Two charcoal samples were excavated from the uppermost part of weathered crust of strata at the Guanghetun Locality 1. Radiocarbon dating results suggest that all of the archaeological remains found in our survey are younger than 30000 years. From the surface-collected and excavated specimens in the study area, a typical Upper Paleolithic lithic industry is identified. Chert is utilized as the main material used for the lithic technology of the ancient occupants, followed by siliceous limestone and some other rock types. The shapes of both microblade cores and blade cores are varied, including wedge-shaped, boat-shaped, and conical-shaped cores, etc; modified tools include end scraper, scrapers, unifacial points, bifacial points, modified microblades, etc. Heavy duty tools are not evident in this site or in the surrounding area.