早-中侏罗世（Toarcian期到Aalenian-Bajocian期）全球气候发生重大变化，研究该时期植物多样性演替及古气候演变为我们了解现在和推测未来气候变化提供科学依据。鄂尔多斯盆地早-中侏罗世地层（富县组和延安组）沉积连续，序列清晰，化石层较多，植物多样性丰富，是研究植物多样性演替和气候演变的天然档案馆。本项研究拟对该地区早-中侏罗世植物化石开展形态学和解剖学相结合的系统分类学研究，精确植物化石系统分类位置；运用“植物群梯度”（Floral Gradient）和“稀疏分析”（Rarefaction）等统计分析方法，结合高精度地层框架，查明植物类群纵向上多样性演替规律；结合早-中侏罗世全球由热变凉的气候变化背景，揭示该地区植物对全球气候变化的响应。该项研究不仅为研究区侏罗纪古气候重建提供详实的古植物学证据，而且为研究该地质时期植物与环境的协同演化关系提供重要科学依据。

Early-Middle Jurassic (Toarcian to Aalenian-Bajocian) was the time of significant change of global palaeoclimate. Studing plant diversity succession and climatic evolution during this period will provide reference for us to understand the climate today and predict future climate change. The Ordos Basin consists of a continuous and well-exposed Early-Middle Jurassic strata (Fuxian and Yan’an Formation). The Early-Middle Jurassic strata which contains major fossil-bearing beds and diverse fossil plants is a natural archives for studying the Early-Middle Jurassic plant diversity succession and climatic evolution. Further study based upon phytomorphology and phytoanatomy of Early-Middle Jurassic fossil plants can greatly contribute to understand their systematic position. On this basis, statistical analysis (e.g., Floral Gradient and Rarefaction) will be applied in order to summarize the Early-Middle Jurassic plant diversity succession on the high precision stratigraphic framework. Along with consideration the global climate change of warming to cooling during the Early-Middle Jurassic period, the responses of plants to the climate change will be summarized. Meanwhile, this work will provide a detail palaeobotanic evidence for the reconstruction of palaeoclimate and help studying the co-evolution between plant and environment during the Jurassic.