Abstract:

The assessment of ecological security is a new topic in the field of untraditional research on security and sustainable development，〖JP〗and is also the basis to set up warning system for ecological security and environment management.In order to establish an effective evaluation method for regional ecological security，the authors built an evaluation index system and then decided the evaluation criteria based on pressurestateresponse conceptual model.The level of ecological security of 17 regional cities in Anhui Province was evaluated by back propagation (BP) neural network channels.It is shown that Xuancheng，Chizhou and Huangshan are in grade Ⅱ；Bozhou，Suzhou，Fuyang，Chuzhou，Liuan，Chaohu and Anqing are in grade Ⅲ；Hefei，Huaibei and Bengbu are in grade Ⅳ；Huainan，Ma’anshan，Wuhu and Tongling are in grade Ⅴ.It is indicated that the method can truly reflect the situation of regional ecological security.Since regional ecological security evaluation of BP neural network method has explicit meanings and simple computational process，and is able to sort and rank subjects according to their ecological security level，it can be applied in the comprehensive assessment of other kinds of ecological systems which have evaluation criteria.

Key words: ecological security, index system, back propagation neural network, Anhui Province