To investigate the variation patterns of fresh weight and cold tolerance traits in new breeding materials of Pennisetum purpureum， identify the main trait factors affecting fresh weight， and select superior materials with high fresh weight and strong cold tolerance， this study used 86 materials of P. purpureum as experimental subjects and analyzed twelve traits for diversity， correlation， regression， path， cluster and principal component analysis. The results showed that the coefficient of variation for each trait of the tested materials ranged from 6.45% （leaf length） to 18.17% （tiller number after regreening）， and the genetic diversity index ranged from 1.8992 （plant height） to 2.0958 （fresh weight）. Regression and path analysis indicated that regreening speed， leaf length， internode length， and stem diameter had significant direct positive effects on fresh weight. Cluster analysis classified the materials into four clusters， with cluster I exhibiting better comprehensive traits and cluster IV the worst. Principal component analysis extracted three principal components， with a cumulative contribution rate of 68.12%. Based on principal component scores， the comprehensive evaluation D value was calculated using the fuzzy membership function method combined with the contribution rates. According to the D value ranking， 17 P. purpureum breeding materials with relatively superior comprehensive traits， including GM1×F-Y189， GM1×F-Y557， and GM1×F-A591， were selected. These results can provide a phenotypic evaluation basis for breeding new high-fresh-weight and cold-tolerant P. purpureum varieties.

Pennisetum purpureum  /  Yields  /  Cold tolerance  /  Comprehensive evaluation