Abstract: With the quick development of economy,increase of population and urbanization, urban water security becomes a limited factor to fulfill the urban sustainable development. On the base of the concept of urban water security, this paper analyzes the current situation of urban water security and its causes. Furthermore, the countermeasures for urban water security are brought out from the aspects of water supply, water quality, water hazard, food, economy, society, zoology, forecasting system and law.