Abstract: In the wetlands of Northeast China, there are 693 species, 42 varieties, and 12 forms belonging to 257 genera and 72 families. Most of the plants are herbs. The dominant families are Cyperaceae, Compositae, Gramineae, Polygonaceae, Ranunculacea and Scrophulariaceae, and the dominant genera are Carex, Polygonum, Salix, Ranunculus, Scirpus, and Potamogeton.Geographically, the wild plant species include 24 types and 25 subtypes, most of which embody the feature of temperate zone, and some have the feature of tropical zone. Compared with those in other areas, the wild plants in the wetlands of Northeast China have 128 species with the feature of cold zone, accounting for 18.47%. The wild seed plant flora in this region geographically correlates well with that in other regions, especially in the Siberia and the Arctic.

Key words: land ecological security (LES), assessment, early warning, rapid urbanization, Caofeidian new district.