| Hebei Hengshui Lake Natural Reserve is the first inland freshwater lake of state-level natural reserve. On the plain of North China, Hengshui Lake is the only natural reserve that has the integrated wetland ecosystems, which Hebei Hengshui Lake Natural Reserve include swaps, water areas, tidal flats, meadows and forests. The natural reserved area lies in Hengshui city, which locates in the south central of north china (115o27'45"-115o42'6"E, 37o31'39"-37o42'18"N). The meters from east to west are 9km, and 21km from north to south. The total areas are 187.87 km~2. On the water area, lakes occupy 3.8778 km~2, ponds occupy 7.239 km~2, rivers occupy 7 km~2, tidal flat occupy 30.30 km~2, and land 85 km~2.At the same time, Hebei Hengshui Lake Natural Reserve also includes some areas of Taocheng District and two districts of Jizhou City.Through the expedition to the Hebei Hengshui Lake Natural Reserve, there are 293 species, belong to 53 families, 176genera, and. in the 53 families of Conservation Area, there are 4 dominant families that contain more than 20 species and it occupies 7.55%. There are 71 genera, 129 species, and the whole number of the species occupies 44.03%. The family which contain10 to 19 species are the following: Cruciferae, Poly gonaceae and Cyperaceae. The families' number occupies 5.66%, 21 genera, 49 species, and the species' number occupies 16.72%. Single genera family includes Aristolo Chiaceae, Portulacaceae and other 17 families, and the families' number occupies 35.85%, the species'number occupies 9.22%. small family and single species constitutes the main parts of the family,and the total number is 46,which occupies 86.79% of the whole number,however , the species'number only occupies 39.25% of the whole. to some extent, it shows the complexity of the reserved area. single genera family has 120 genera,which occupies 68.18% of the whole, and the species'number occupies 40.96% of the whole. 2 to 5species'of single genera family occupy 86.01% of the whole. all of the above mentioned constitutes the integrate family,which reflect the antiquated origin of the reserved area.According to the Chinese Seed Plants, the plants are divided into shrub, vine, perennial herb,annual herb and aquatic grass. They are in accordance with the life-form system of the shapes. Among these plants, grass vegetation plays a great superiority, altogether there are 287 species, occupies 94.53%, it shows obvious north temperate region's vegetation feature. According to the opinion of Professor Wu Zhengyi about the areal-types of genera of China seed plants, these 176 genera can be divided into 14 different types, for the first class, 47genera (111species) belong to Cosmopolitan., occupies the Reservation Area genera's numbers 26.70%, and species'numbers 37.88%; For the second class, North Temperate distributes 41genera (67 species) occupies Reservation Area genera's' numbers 23.3%, and species' numbers 22.87%; For the third class, Pantropic distributes 33 genera (42 species) occupies Reservation Area genera's numbers 18.75%, and species'numbers 14.33%. The result explains that the Reservation Area plants show obvious North Temperate regions feature. The wild life resource plants in the Reservation Area is divided into drug plants, potherb plants, fodder plants, oil plants, textile plants, wild honey plants, wild flowering and ornamental plants. Among these plants, drug plants: 76 species, potherb plants: 29 species, fodder plants: 108 species, wild oil plants: 24 species, textile plants: 10 species, wild honey plants: 48 species, wild flowering and ornamental: 38 species. And the wild soybean belongs to the national-second class protective plants; we should pay more attention to it.Through the investigation, we find that there are 19 species of foreign invasive plants in the national Reservation Area. The main invading way is unconsciousness. And most of them have established steady breeding population in the Reservation Area. Malignant plant Flaueriinae bidentis has made great damage and effect. In the process of dealing with the circumstance, analyzing the invading feature and the biological effect, we give the detailed methods and measures. Wetland is a valuable ecosystem, and it is a weak system. In order to protect the Reservation Area wetland ecosystem, keep the diversity of its biology, develop wetland ecosystem'functions and profits to the extent, and for all species of existed problems in the Area, we raised wetland protective measures.The thesis contains plants'names of the Reservation Area and 42 bibliographies. Altogether, there are 3 figures, 6 tables.
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