[Objective] The water quality of the river basin was evaluated through the establishment of related models in order to provide practical tool for ecosystem restoration. [Methods] Using analytic hierarchy process(AHP), fuzzy membership function and comprehensive index method, taking Sushui river basin as a study area, factors that influences water quality indexes were evaluated comprehensively. Evaluation system of water environment quality and was established and the models of the environmental health in arid and semi arid river basin was illustrated. [Results] In Sushui river basin from 2008 to 2011, the water quality environment was categorized as grade Ⅲ, at a status of ordinary health. The evaluation results were commonly the real status. [Conclusion] The health evaluation system of water environment quality in that arid and semi arid river basin proved reasonable, can meet the needs of health assessment of water environment quality in river basin.