In this study, we selected the four typical halophyte plant communities of beachwetland of semiarid area in the Dangjiacha Wetland Nature Reserve of Xiji, Ningxia to explore diversity patterns of four halophyte plant communities, including Tamarix sp., Salicornia europaea, Suaeda glauca and Phragmites australis(dwarf type) and also studied the characteristics of total salt and pH in soil of four halophytes communities and bare beach. The main conclusions are as follows：(1) a total of 26 plant species were found among four halophyte communities. Among them, Chenopodiaceae, Gramineae and Compositae respectively accounted for 23.08%,19.23% and 19.23% of the total plants. Tamarix sp. community species diversity and the community composition of S. europaea, S. glauca and P. australis are monotonous, mostly monotonous community patches. The important values of the dominant species in the three halophyte communities were significantly higher than those in the saline shrub (P<0.05). The important value of Tamarix sp. community was between 0.13 and 0.54, which was significantly different from that of the three salted meadows (P<0.05). (2) Margalef index,Shannonwiener index and Simpson index were the largest of Tamarix sp. community, which were 1.105,1.706 and 0.552, respectively. Pielou index is S. europaea > P. australis> S. glauca > Tamarix sp., namely 1.166,1.021, 0.997 and 0.813. (3) The effects of total salt content on the surface layer of the four kinds of halophyte communities and the bare beach were significant (P<0.05). In the surface layer the soil total salt was bare beach＞ S. europaea community> S. glauca community> Tamarix sp. community> P. australis community, respectively between 0.44％-0.58%,0.49％-0.53%,0.15％-0.54%, 0.27％-0.45% and 0.18％-0.39%. The soil pH of Tamarix spp community was decreased with the soil depth. The soil pH of the salted meadow is quickly increased with the soil to deepen, after the basic unchanged. The pH of the bare beach is quickly declined with the soil to deepen, after the basic unchanged.