1. SAR Summary 2. SAR Classification Classification by Origin of Resources Classification by Hydrophilization Process Classification by Cross-linking Method Classification by Products’ Figures Classification by Preparation Methods Classification by Degradability 3. SAR Properties 4. SAR Structure Water Absorption Free Molecule or Water Absorption Base Material Cross-linking Agent Initiating Agent Other Auxiliary Agents 5. SAR Preparation Methods SAR Preparation by Natural Starch SAR Preparation by Fiber SAR Preparation by Synthetic High Molecule 6. SAR Application Application in Agriculture, Forestry, Gardening and Desert Control Application in Medical Health and Physiological Hygiene Application in Industry Application in Construction Application in Other fields 7. SAR Modification and Development Fiber Modification Water- absorbing and Non-woven Modification