Abstract: The objective of this research is to explore the genetic diversity of bluegrass germplasm resources by morphological indexes, and provide basis for variety improvement and parent choice. 14 morphological indexes of 34 bluegrass accessions from different geographical origins were studied. The morphological diversities were analyzed by principal component analysis and cluster analysis. The results showed that there were extensive variations in morphological characteristics in different bluegrass accessions. The most significant variance was node numbers of main stem, followed by the number of flowers per head and leaf length, while the growth days of turn green-mature stage had the minimum variance, 1.86%. Principal component analysis showed that leaf length, leaf width, height of plant and height of fertile tillers were the main factors which produced morphological variation of 34 wild bluegrass accessions. Based on the 14 morphological indexes, cluster analysis showed that all 34 accessions of bluegrass were divided into 3 groups, the first group and the third group had obvious differences.