Abstract: In order to select special potato varieties suitable for planting in cold and humid areas and promote the further implementation of potato staple food research and industry development in China, a total of 25 varieties were introduced and collected to carry out variety comparison test in cold and humid areas in China. The ecological adaptability (agronomic characters), processing quality indexes (dry matter, reducing sugar and starch content) and processing related enzyme activities (PPO and POD activities) were compared. By means of membership function, cluster analysis and correlation comprehensive analysis, 5 varieties suitable for local planting were screened out, which were Longshu 15, Longshu 14, Qingshu 9, Longshu 10 and Longshu 7. The main indexes of the recommended varieties were yield with 27941.83-31143.77 kg/hm2, 74.13%-76.51% water content, 0.08%-0.20% reducing sugar content, 17.59%-23.58% starch content, 6.44-10.82 U PPO activity. It was recommended that these varieties could be popularized and planted in cold and humid areas.

Key words: cold and humid areas, potato staple food and industry development in China, selection of special variety, processing index