Abstract: The tuber yield per plant, starch content, vitamin C content, protein content, reducing sugar content,soluble sugar content and polyphenol oxidase activity of 14 potato varieties were analysed, combined with principal component analysis and cluster analysis, the potato quality was comprehensively evaluated andpotato varieties which were suitable for planting in Yulin area and suitable for different processing purposes and good quality were screened out. The results showed that there were great differences in quality indexes among 14 potato varieties. The coefficient of variation of tuber yield per plant, starch content, vitamin C content, protein content, reducing sugar content, soluble sugar content and polyphenol oxidase activity were 54.45%,14.92%,44.71%,38.98%,82.61%,44.11% and 23.01%, respectively. The tuber yield per plant of variety Longshu 13 was the highest. The starch content of variety Ningshu 16 was the highest. The protein content of variety Yushu 5 was the highest. The soluble sugar content of variety Longshu 6 was the highest. The vitamin C content, reducing sugar content and polyphenol oxidase activity of variety Longshu 14 were the highest. The correlation analysis showed that there were significant or extremely significant correlations among the quality indexes of 14 potato varieties. The quality data were standardized for principal component analysis, and five representative principal components were extracted（the cumulative contribution rate reached 92.831%）. By calculating the factor scores of 1-5 principal components and the comprehensive scores of quality indicators, the comprehensive scores of varieties Xisen 6 and Ningshu 16 were in the first and second places, respectively. The cluster analysis was carried out on the tested potato varieties by using the comprehensive score of principal component factors. When the threshold was at 4, 14 potato varieties could be divided into 3 groups. The comprehensive quality of potato in group 1 and group 2 were better, accounting for 54.14% of the tested materials（8 kinds in total）,which including three germplasm（Longshu 6, Xisen 6 and Jishu 1）that could be used for both potato starch processing and whole powder processing, two germplasm（Yushu 3 and Longshu 14）that could be used for whole flour processing and fried food processing, one germplasm（Acria） that could be used for vegetable planting on a large scale, one germplasm（Yushu 5） could be used as both potato fried food processing and whole powder processing, and one germplasm（Ningshu 16） could be used as both starch processing and vegetable.