Abstract: ObjectiveThe genetic diversity of Solanum tuberosum L. germplasm resources from winter planting area in southern China was analyzed in order to provide reference for new variety breeding,planting and utilization of winter S. tuberosum in southern China.MethodThirteen quality traits and twelve quantitative traits of twenty-four S. tuberosum germplasm resources were investigated and determined,and genetic diversity analysis and cluster analysis were conducted.ResultThe results showed that genetic diversity indexes of each quality trait were high,ranging from 0.7415 to 2.3303, among which those of potato shape was the highest while those of stock type,leaf edge shape and top lobular shape were the lowest. The variation coefficients of quantitative traits of 24 germplasm resources were 0.70%-188.16%,among which the tuber weight per plant was the largest,followed by stem weight per plant,indicating that its variation degree was large and trait segregation was easy to occur. The specific gravity was the lowest,which showed that S. tuberosum seed-ling emergence rate was stable among the germplasms. The correlation analysis showed that the growth period of 24 S. tuberosum germplasm resources was extremely significantly positively correlated with stem weight per plant and average yield(P<0.01,the same below),while it was extremely significantly negatively correlated with leaflet pair. There was extremely significant positive correlation between plant height and tuber weight per plant,stem weight per plant,while plant height was significantly negatively correlated with main stem number per plant(P<0.05,the same below). The stem weight per plant was significantly positively correlated with tuber weight per plant and average yield. Tuber number per plant was significantly positively correlated with leaflet pair,but extremely significantly negatively correlated with com-mercial potato rate. The emergence rate was significantly positively correlated with average yield,but significantly nega-tively correlated with leaflet pair. The specific gravity was extremely significantly positively correlated with tuber dry matter weight,and extremely significantly negatively correlated with average yield. The results of cluster analysis showed that 24 S. tuberosum germplasm resources could be divided into four types:high yield and high stock,medium yield and medium stock,low yield and medium stock,and low yield and low stock,among which medium yield and medium stock accounted the largest specific gravity and high yield and high stock the least.ConclusionThe 24 S. tuberosum germ-plasm resources are rich in genetic diversity,and 2 of them belong to high yield and high stock type(Min 08085008 and Min 09330143),which can be used as parent materials for breeding new high-yield winter planting varieties of S. tuberosum in southern China.