This paper selects 11 indicators to establish water environmental carrying capacity model of Suzhou City, China. Based on the analysis of the value change trend of water environment carrying capacity in Suzhou City from 2003 to 2010,it shows that the ecological carrying capacity of water environment rise sharply which the value is 0.30 to 0.67 and the carrying capacity level is in the general level. Population carrying capacity of water environment and economy carrying capacity of Water environmental increase slowly that carrying capacity values are 0.22 to 0.35, 0.56 to 0.75.The overall level of water environmental carrying capacity is low and the upward trend is slowly rising that carrying capacity value is 0.22 to 0.32.It indicates that the water environment of Suzhou City is relatively fragile.