Abstract: The principle component analysis(PCA) was used for statistic analysis on eight direction sign of post-harvest plum fruit. The results showed that all the direction indice could divide into four principal component factors, their dedicative rate was 52.774%，23.154%，15.025% and 7.987%，respectively, and the accumulative proportion was 98.941%. The integrated evaluate model on these basics showed that plum fruit mature during 0 to 4 days of storage and the quality of fruit was better in this period. The physiological change of plum fruit was senescent during 4 to 10 days of storage, the fruit lost value at the 10th day.