Abstract: As the link point of regional resource theory and tourism exploitation activity,the evaluation of regional ecotourism suitability plays a significant role in the regional industrial allocation and macroscopic control, but few researches have been done in this field. Based on the concept of regional ecotourism suitability, the evaluation indices system of regional ecotourism suitability was compos ed from the aspects of tourism resources, eco-environmental quality, and social-economical conditions, and by means of the spatial analysis of GIS and the self organization feature map in artificial neural network model, a cluster analysis was performed to assess the regional differentiation of ecotourism suitability in the 72 counties of Zhejiang Province. According to the results of cluster analysis, the study areas were divided into five types of regions,i.e, most suitable, highly suitable, medially suitable, generally suitable, and key construction regions. The ecotourism suitability of these regions was evaluated, and the countermeasures for regional sustainable development were put forward, which had consultation meaning to probe into the orientation and development strategy for regional tourism industry.

Key words: East China Sea, Red tide, Remote sensing