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Based on the theory of multivariate statistical analysis,this paper applies strictly factor analysis and cluster analysis methods in the evaluation of urban air quality,by calculating the component score and synthesis score,evaluates urban air quality and rank,and applies cluster analysis method according to component score,and gives a practical step on computer analysis of the statistical analysis.The chart of cluster analysis of urban air quality which is created by cluster analysis and common component model can provide a reference for the work of multi-parameter comprehensive environmental assessment of the qualitative analysis and Calculation based on the theory.