This paper analyzed the results of new varieties in 2008 in the five variety regional trials of medium japonica rice of Liangshan by the method of grey relational analysis. The results indicated that the expression of comprehensive characters of Xijing-1 was better than that of Xijing-2, Tianxiang-1 and Xijing-3, which of 2006-427 was the poorest. The results showed that, through comparing the results of grey relational analysis and variance analysis of yield, variance analysis can not respond some other characters correlated with yield characters and production requirement and is easy to cause one-sidedness of varieties assessment, but grey system theory for analyzing the expression of comprehensive characters of new varieties can overcome the disadvantages of variance analysis of yield and remedy its defects.