The environmental quality is a fuzzy concept, which has many factors and many levels. There is no absolute standard to assess environmental quality. If adopting classic mathematics to assess environmental quality, the unclear boundary and transition of fuzzy factors can not be dealt with. So, this paper, on the basis of fuzz comprehensive assessment of single environmental factor, discusses the assessment of general environmental quality with fuzzy mathematics. In addition, taking a certain mining area as an example, the fuzz comprehensive assessment of general environmental quality has been carried out. the assessment result indicates the fuzzy mathematics offers an efficient method for general assessment of environmental quality.