Pricipal components analysis was conducted in 867 cultivated varieties from grape resources repository at Zhengzhou Fruit Research Institute of CAAS based on 47 phenotypic charactericses. The software of DPS3.01 was employed to standardize the data set and the germplasm were primarily selected with euclidean distance and ward method. Grouping and gradually cluster were used in this paper, each group 124, 170, 205 and 252 varieties were respectively obtained when the germplasm were sampled by square root strategy and ratio at 15%、20%、25% and 30% with the method of group-dividing and stepwise clustering. The representative of primary core collection was tested by using genetic diversity index, reserving phenotypes of characterics. One hundred of twenty-four varieties of grape primary core collection represent 96% of the whole germplasm when the germplasm was divided based on types and further sampled at ratio of 15% with the method of square root strategy in subgroup. The results showed that the primary core collection could well represent the genetic diversities of the whole collection．