Abstract: A China water security dynamic model were built up based on the systematical analyses of characteristics and their interrelationship of sub-systems of water resource system in China.In modeling,four scenarios,as the business as usual,the technology and economic scenario,the institutional,value,and life style changes scenario and the towards sustainable development scenario,were simulated in terms of life security,economical security,food security,ecosystem security,environmental security and social security.The simulation suggested that the water security in China can be guaranteed by combined with accelerated water use technology innovation,new water management policy and management system reform,and ecological and economical awareness on water resource impnwement.