Abstract: In order for the lodging of sweet sorghum -depth study, 66 sweet sorghum strains were investigated and studied in this paper, and the identification and evaluation of sweet sorghum lodging was conducted by using cluster analysis, factor analysis and analysis of genetic diversity. The results showed that, the strains had significant differences and abundant genetic diversities. Clustering analysis showed that, strains were divided into seven groups in the genetic distance of 1.955, most of the strains were concentrated in the second group. Correlation analysis of agronomic characters showed that, stem diameter and center of gravity height ratio were main characters of sweet sorghum. According to the evaluation standard of energy using sweet sorghum: stem juice rate was 45% or higher, stem SAP mixed hammer (Bx) was 15% or higher, stem diameter was 1.90 cm or more, the center of gravity height ratio was 0.445 or less, the lodging resistance grade was 6 or less, ‘7050 B×8000 za-1B’ had the best comprehensive performance, and it could be used in the production and breeding.