Abstract: The complex adaptive system theory was introduced to generalize production water agents into three levels in a water right trade model. The agents' activity was simplified with four major behaviors: water use, water buying, water selling and water saving, and they were determined by an economics agent equation. Maximum regional economic benefit is the target of optimization. This model was applied to the water market in Bayannur city that is facing a water shortage problem. The results indicate that it is effective in analysis of the potential water which can be traded and it supplies a decision support to determination and adjustment on water price in water market for water resource management sectors.