Based on field observed results of plant weight,plant height,branching number,branch diameter,stem and leave rate,grey relate degrees of plant height,branch numbers,stem diameter,stem and leave rate to a plant fresh weight were analyzed in the paper.Even though five characters of five alfalfa varieties were significant difference,grey relate degrees of plant height,branches number,branches diameter,stem and leave rate to a plant fresh weight were similar.Among the grey relate degree,branch diameter was the first,plant height was second,branching number and stem and leave rate were similar.The result is of value to supply reference for breeding of high yield alfalfa new varieties.