Abstract: In order to illustrate the community characteristics and population patterns of Tamarix ramosissima in Dunhuang Xihu National Nature Reserve of Gansu Province, northwestern China, we investigated environmental factors, i.e. latitude, longitude, elevation and soil types in 35 quadrats (20 m × 20 m) from October 2006 to June 2007, by using three diversity indices, i.e. the Margalef’s richness index, Simpson’s diversity index and Pielou’s evenness index, as well as the methods, such as a clump index, mean crowding index, index of patchiness, dispersion coefficient and negative binomial parameter. There were 20 species in the T. ramosissima community, belonging to 19 genera and 12 families, of which 8 shrub species belong to 8 genera and 5 families and 12 grass species belong to 11 genera and 7 families. The T. ramosissima community was sorted into four association groups: Ⅰ Ass. Group T. ramosissima+Phragmites communis, Ⅱ Ass. Group T. ramosissima+Lycium ruthenicum, Ⅲ Ass. Group T. ramosissima+Halocnemum strobilaceum and Ⅳ Ass. Group T. ramosissima sand dune. The value of the Margalef’s richness index was 0.375, the Simpson diversity index 0.330 and Pielou’s evenness index 0.487. The Margalef and Simpson indices showed the same distribution patterns among the four groups, both in the following order: ⅢⅡⅠⅣ, while the order of Pielou’s evenness index was: ⅢⅣⅡⅠ. Simpson’s diversity index showed a significantly positive correlation with Pielou’s evenness index, with a correlation coefficient of 0.920 (α0.01). The populations of T. ramosissima and P. communis both appeared as clumped distributions, of which the P. communis population showed stronger invasive and recruitment capacity compared with T. ramosissima. 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