Abstract: The cultivar evaluation of China southern winter barley trial using GGE biplot during 2009-2010 was reported. The following questions could be visually addressed from the biplots： the growth performance of each cultivar in a given test site, mean performance and stability of each cultivar, the most favorable environments for a given cultivar, similarity of a pair of cultivars or environments, the difference between a pair of cultivars and the interaction between cultivars and environments. The results on biplot indicated that Supi No.3 was a cultivar with wild adaptability. Graphic assessment of yield\|related trails showed similarity of effective ears and yield was high in the test, and effective ear was the restrictive factor of yield．

Key words: GGE biplot, barley, trial, interaction between cultivar and environment