In recent years, systematic archaeobotanical work has been carried out at the Shangjing (Upper Capital) City of the Liao Dynasty, offering crucial data on subsistence and consumption patterns during the periods of minority regimes, such as the Liao and Jin Dynasties. Through flotation work, extremely rich plant remains were found at several sites of the Jin Dynasty at the Shangjing City, involving 11 species of crops and more than 50 species of non-crop remains. Especially in the ancient living area such as the “1st street (Yihao Jie)” of the Shangjing City, the discovery of plant remains was particularly prominent. The combination of crops showed a dry-land agricultural system based on multispecies but dominated by foxtail millet (Setaria italica) and broomcorn millet (Panicum miliaceum), while the non-crop remains contained a large number of possible livestock forage seeds, providing an important clue for the degree and scale of animal husbandry development. Exotic crops such as watermelon (Citrullus lanatus) and flax (Linum usitatissimum) appeared at general residential sites, and the special preservation context of cannabis (Cannabis sativa) and grape (Vitis sp.) seeds also provided evidence for better understanding of their utilization. By the comparison with studies of plants of the same periods nearby, we could also trace the influences of site level, ethnic group and other factors on the local subsistence model and the crop selection.