• 1.1 Water, national resources and environment 1.2 Water characteristic and quality of water 1.3 The Methods of Demineralization of Water 1.4 Waste Water 1.5 Surface Tension and Surface Absorption 1.6 Construction Characteristic and Solution Property of Tenside 1.7 Usually Employed Tenside and their Biodegradability • 1.7.1 Anionic Tenside • 1.7.2 Nonionic Tenside • 1.7.3 Cationic Tenside • amphoteric Tenside 1.8 Functional 1.9 Relation of Chemical Construction and Property of Surfactant