Abstract: 【Objective】 To clarify the quantitative characteristics and diversity variation of Sagebrushdesert plant communities on the northern slope of Tianshan Mountains and explore the differences in the quantitative characteristics and diversity of plant communities in different regions in the hope of providing a theoretical basis for scientific management of this type of desert grassland. 【Methods】 The field survey and sampling method were used to investigate and analyze the plant community characteristics of sagebrush desert in the western, middle and eastern sections of the northern slope of Tianshan Mountains. 【Results】 (1) From the western to eastern section of the northern slope of Tianshan Mountains, the biomass of sub-shrubs increased gradually, and the eastern section was significantly higher than that in the western section by 266.51% (P<0.05).The biomass decreased gradually from west to east (P<0.05); the quantitative characteristics of annual herbs and ephemeral and ephemeral-like plants all showed the maximum value in the middle section.(2) The height, coverage, density and biomass of plant community increased first and then decreased from west to east, and reached the maximum value in the middle section.Patrick's richness index, Simpson's dominance index, and Shannon-Wiener species diversity indexes all showed a trend of first increasing and then decreasing from west to east in space, while Pielou's evenness index showed a gradually decreasing trend from west to east.(3) The correlations between the quantitative characteristics and diversity of plant communities in grasslands in different regions of the northern slope of the Tianshan Mountains were different.Overall, the coverage, density and biomass of sagebrush desert grasslands were positively correlated with plant diversity, while plant height negatively correlated with plant diversity.(4) The main influencing factors of the spatial variation of sagebrush desert plant community were altitude, soil organic carbon and annual average temperature. 【Conclusion】 The quantitative characteristics and diversity of sagebrush desert plant community on the northern slope of Tianshan Mountains show a trend of first increase and then decrease from west to east, and altitude, soil organic carbon and annual average temperature are the most important environmental factors affecting the composition and diversity of plant community.