Research conclusions: (1)Typha orientalis, Nymphaea tetragona, Lythrum salicaria, Scirpus tabernaemontani, Canna generalis and Iris pseudoacorus are chosen as suitable plants for constructed wetland in salty seashore area at the North of China, and in which Iris pseudoacorus is with high salinity tolerance. (2)As plants for constructed wetland in salty seashore area, Typha orientalis, Nymphaea tetragona, Scirpus tabernaemontani, Canna generalis and Iris pseudoacorus are of high removal efficiency of nitrogen and phosphor and Iris pseudoacorus is the preferential one. (3)Iris pseudoacorus, which generally has a long florescence of five or six months and has a characteristic of cold-resistant, could be the preferential plant for constructed wetland in salty seashore area at the North of China, not only with high salinity tolerance and removal efficiency of nitrogen and phosphor but also with good landscaping benefits. (4) Typha orientalis, Nymphaea tetragona, Scirpus tabernaemontani, Canna generalis as plants for constructed wetland in salty seashore area and Iris pseudoacorus as the preferential one for constructed wetland could be chosen for the areas with saline-alkali soil at the North of China.