Abstract:The environment is an important factor that needs to be considered in the development of human society. The evaluation of urban pollution plays an important role in the balance between social development and environmental pollution. In response to the current problem of incomplete indicators in environmental pollution evaluation system, firstly, seven environmental pollution indicators among the three types of pollutants were analyzed, including solid, liquid and gas, and the weight was determined by analytic hierarchy process. Secondly, the gray fixed weight clustering model was used to comprehensively analyze, evaluate and cluster the pollution samples of the provincial cities in Henan Province from 2013 to 2017. Finally, the evaluation of the pollution changes within five years was completed. It is concluded that the pollution situation has differences between east and west and has improved year by year. This method' s rationality and feasibility are proved by the analysis result of the case,and it is a reference for relevant departments to formulate policies.