We study on two specific conditions combining reviews and star ratings. To identify specific star ratings’ influences on reviews, we structure a mutual information model which displays that medium review has been less correlated with star rating but good review has been strongly correlated with star rating. To identify specific quality descriptions’ effects on reviews, we place emphasize on adjective which directly show customers’ inclination and calculate occurrences of adjective in each review. We use Pearson correlation coefficient to illustrate the correlation between reviews and star ratings.