Abstract: Division is the basis and the premise for optimizing regional environmental resourees planning．In this paper，based on the prindples of sustainable development and State Eco-environment Construction Planning ，a new index system is established for eco-environment cons truction in Heihe watershed corresponding to local nature and economic conditions，assisted by some old special classification and partial planning results and some theory of modem ecology，economy and physiography，then，Heihe water-shed has been divided into three big arets and four sub-areas for eco-environment construction by SPASS．and some construction models have been put forward according to the major features of different divisions．