根据洪湖近期水质监测数据资料，采用灰色模式识别模型方法对洪湖水质进行了分析评价，并利用软件surfer8.0生成洪湖不同季节的水质综合指数等值线图进行空间分异特征分析，结果表明：洪湖水质介于3～4级水之间，秋季水质较好, 春季水质最差，水质随季节变化较大，湖内围网区域和进出水口区域之间水质差别较大。

On the basis of the monitoring data of water quality during the period of 1990s, this paper presents the assessment of water quality in Honghu Lake by the grey-mode identification model. And the water quality comprehensive index isolines of Honghu Lake's different seasons are drawn by applying the surfer8.0 software. From the isolines, it can analyze the spatial distribution features of water quality in Honghu Lake. The research results indicate that the water quality of Honghu Lake remains between the grade 3-4 in criterion of surface water and in mesotrophic state. In autumn, the water quality of Honghu Lake is better, but in spring it is the worst. And in different seasons, it changes greatly. The difference of water quality between fish-screen regions and intake-outlet water areas is very obvious.