Abstract:The author of this paper put forward an idea of water safety assessment by adopting the analytic hierarchy process(AHP)and the matter element analysis method. Based on PSR model, selecting 12 indices that reflect water safety, and determining the weight coefficient by using AHP, a matter element evaluation model of type identification was established. Taking Xinzheng City as an example, the author firstly analyzed the water safety level of each index in 2006, and then comprehensively evaluated the water safety level from 2006 to 2011. The results show that the water safety level of Xinzheng City in the years of 2008 and 2010 belongs to the safety grade, while in the years of 2006, 2007, 2009 and 2011 belongs to the unsafe grade with the Ⅳ level of water safety. However, there are some possibilities for the water safety level transforming to other grades. Based on that, some corresponding measures were put forward.