Phenotypic principal component and cluster analysis were carried out on agronomic characters of two Yunnan Plateau Japonica Rice backbone parents（Dianyu 1 and Todorokiwase）and their derivative varieties. The results showed that: (1) There were no significant differences in panicle length, flag leaf angle, flag leaf width and seed setting rate between two backbone parents compared to others agronomic characters. (2) There were also no much differences in agronomic characters among derivative varieties from two backbone parents except flag leaf angle, number of panicle per plant, number of filled spikelets per panicle, seed setting rate and 1000-grain weight. (3) The accumulative contribution rate of five major principal component factors from these varieties derived from Dianyu 1 and Todorokiwase reached 85.54% and 85.27%, respectively. The first factors were plant type and number of grains per panicle, their contribution rate as 39.9% and 41.1% respectively. (4) Seventy-four varieties were clustered into six categories according to genetic distance, of which 85% of the varieties distributed in Class Ⅰ and Class Ⅲ. The main features of these varieties were plant height 90 ~ 100 cm, flag leaf length 25 ~ 34 cm, width of 1.5 ~ 1.7 cm, Panicle length of about 20 cm, 91 ~ 138 grains per spike, 7 spikes per plant. Seed setting rate per plant and 1000-grain weight were 85% and 27 g, respectively.