In comprehensive evaluation of a moderately prosperous society model's research, the majority concentrates in choice of evaluation target of a moderately prosperous society, but overlooked the study of comprehensive evaluation's method. This article has made some discussions to this aspect. This article used the factor analytic method to establish an evaluation model of a moderately prosperous society, this model was mainly the application factor analytic method carries on processing to model each target, after the choice public factor, calculated always scores points and ranking. Using this mode has carried on the empirical analysis to comprehensive evaluation of a moderately prosperous society to 13 cities in Jiangsu Province in 2007, its measure results with other methods (the comprehensive score method and matter-element theoretical model) the measure results are basically consistent. Through this model evaluation, on the one hand may verify mutually with other method measure results, on the other hand, may also take each city whether to achieve a moderately prosperous society.