Chapter 1 Introduction 1.1 An Overview of Grasslands 1.2 Study Overview 1.2.1 The Study of Grassland Grazing Ecosystem 1.2.2 The Study of Grazing Systems 1.2.3 The Study on the Effect of Grazing on Grassland Communities 1.2.4 The Study on the Effect of Grazing Systems on Grassland Communities in Mongolia 1.3 Research Background and Significance 1.3.1 Research Background 1.3.2 Research Significance 1.4 Research Content and Purpose 1.4.1 Research Content 1.4.2 Research Purpose Chapter 2 Study Area 2.1 An Overview of Mongolian Plateau 2.1.1 Natural Condition 2.1.2 An Overview of Socio-Economic 2.2 The Evolution of Grazing System 2.2.1 The Evolution of Grazing System in Mongolia 2.2.2 The Evolution of Grazing System in Inner Mongolia Autonomous Region 2.2.3 Comparison of Grazing Systems in China and Mongolia 2.3 The Overview of the Study Site 2.3.1 Sukhbaatar Province 2.3.2 The Abag Banner of Xilingol League …… Chapter 3 Research Design and Methodology Chapter 4 Analysis of Results Chapter 5 Discussion Chapter 6 Conclusion References Appendix