Abstract: Dynamic studies on growth index, root yield and brix of five genotypes of feeding beet were carried out, and the grey correlation analysis was made on root yield and brix and eight main indexes to provide a theoretical basis for solving imbalance between livestock and grass, mechanization and large- scale development of feeding beet. The results showed that petiole thickness and yield were the dominant factors affecting brix, plant height and 100-plant weight of seedlings were the dominant factors affecting the yield of feeding beet, and leaf number as an important index of feeding beet affected not only the brix of roots, but also the yield of roots. Polyploid varieties were of great value in improving stress resistance and sugar content in roots of fodder beet at seedling stage. The comprehensive index of‘Feeding No.3’is outstanding, and its yield ranks first among the tested varieties (180518.40 kg/hm2), which has high promotional value.