Reservoirs are artificial wetlands with functions such as flood control, water supply, improving livelihoods and regulating the ecological environment. Taking the plants of Sifeng Mountain Reservoir in Jiamusi City as the object of investigation, we studied and analyzed the diversity of plant resources in the reservoirs, aiming to provide a basis for the conservation and use of plants in the reservoirs and the ecological restoration of artificial wetlands. The field trekking method, literature research method, and sample method were used to study the reservoir plant resources in terms of their life types, ecological types, distribution types and plant communities. The survey found 175 species, 137 genera, and 56 families of plants around the Sifeng Mountain Reservoir, including 2 species under National Grade II status. The predominant plant families are Compositae and Rosaceae, while the main plant genus is Artemisia L. Among the six life types, perennial herbaceous plants are dominant, with 86 species, accounting for 49.14% of the total plant population. The ecotype is dominated by mesophytes (118 species), followed by wet plants (56 species) and aquatic plants are the fewest, with only one species. The type of distribution area is clearly temperate. The 16 sample plots were divided into six communities based on species importance, with the plant communities showing a distribution of patches with varying sizes.