Abstract:In order to understand the genetic diversity of local pear (Pyrus spp.) in Guizhou Province, thirtyfour germplasms were collected and their fruit qualities were observed for three years. Twelve indicators of fruit quality were analyzed using principal component analysis (PCP) and Q-type cluster methods. The results showed that there was significant difference among the 34 pear germplasms in all fruit quality traits except for edible rate, demonstrating that pear germplasm resources in Guizhou have abundant genetic diversity. The principal component analysis showed that the first five principal components accounted for 85.52%, respectively, indicating that the contribution rate of fruit quality characters scattered and cumulative contribution rate was not obvious, and at the same time showing that the variation of fruit qualities of pear resources have pleiotropy. Q-type cluster analysis showed that Haizi pear-3 and Hulu pear cluster each, which revealed their unique quality characteristics. These would laid foundation for development and utilization and variety selection of pear germplasm resources in Guizhou Province.