The spatial pattern and interspecific association of plant population are developed as a result of the longterm adaptation and selection of the ecological characteristics of plant population to environmental conditions. The spatial pattern and interspecific association of Salicornia europaea and Suaeda salsa were studied by using phytosociological methods and point pattern analysis in Qinwangchuan National Wetland Park. According to the density of S. europaea, the plots were divided into three density levels: high density (I, >800 plants·m^-2), medium density (II, 400-800 plants·m^-2), and low density (III, <400 plants·m^-2). The results showed that, with the decrease of the density of S. europaea, the plant height and aboveground biomass of S. europaea decreased (P<0.05), while those of S. salsa increased (P<0.05). The S. europaea exhibited clumped distribution from very tiny scale to small scale in Plots I and III, and at all scales in Plots II. The S. salsa exhibited clumped distribution at all scales in Plots I, and from small scale to medium scale in Plots II and III. S. europaea and S. salsa showed negative and no correlations between each other in Plot I (P<0.05), and no correlation in Plot III, and negative to positive correlation in Plot II (P<0.05). The asymmetric competition under the regulatory mechanism of plant density in wetland caused the replacement of dominant species, reflecting the life history strategies of plants in adaption to the environment.