Along with the industrialization and the urbanization approaching rapidly, regional spatial development turned to environmental sensitive area, for example, sloping field, lakeshore etc., which has affected regional sustainable development. Carrying on the natural geographical features of Suzhou city, to classify the type of environmental sensitive area and to make a clear distinction boundary of the future regional development and protection has a vital practical significance for realizing the region economy sustainable development. From ecological protection, water source safeguard, pollution, farmland zoology and disaster prevention etc., the environmental sensitive area in Suzhou city will be divided into the ecological sensitive area, surface water source sensitive area, contaminated sensitive area, high quality farmland sensitive area as well as the latent disaster sensitive area——five kinds. In the foundation of being clear about its spatial scope, comprehensive evaluation of environmental sensitive area had been made and many kinds of sensitive environment protections and the development suggestions had been pointed out.