Abstract: The soil seed bank composition, the type quantity, the spatial distribution and the species multiplicity of the urban green space were studied，the result shows that 42 kinds of plants appear in the soil seed bank of urban green land, among them 1 477 plants appear in first floor, the diversified index is 2.05, the degree of consistency is 0.58, the max diversified index of species is 3.56, second layers of diversified indexes of species, degree of consistency and diversified index of biggest species are lower than the first floor, it is 1.94, 0.56 and 3.47 respectively, plant kinds should be a little fewer. The abundant degree of plants, seed seedling amount, and the diversified index in the seed bank of the urban green land are lower than the natural second growth forest in outer suburbs. The soil seed bank of urban green land contains some potential populations, some plants can be used for city afforestation.

Key words: urban green space, soil seed bank, nature secondary forest