Abstract: This paper describes a new parallel adaptive hierarchical network model for image segmentation. The model consists of a layer for extracting local features and forming region in a parallel recursive way, a layer for adaptive statistcal clustering, and a layer for making decision under the guidance of global distribution features. The communication between these layers is realized by means of coorperation mechanism. With the automatic non-parameter clustering method, the un-surpervised image segmentation is completed by integrating the local gray feature with the global random distribution features. The model has been applied to the adaptive segmentation of outdoor natural scene image. Even though in the case of different enviroment, the experimental result is rather sa isfactory.