The relative significance of effect of genotype,test site,genotype × site interaction on 12 quality characteristics was studied in the paper,according to data collected from 38middle early season and middle season japonica rice varieties tested at 4 sites in Jilin province in 2003.The results showed that: Chalky trait,amylose content,milled rice recovery and grain length was seldom reached the first class of national rice standard.There were significant differences in all quality characteristics among different genotype,test site and genotype × site interaction.All quality characteristics were predominantly influenced by genotype effect.The amylose content was mostly influenced by genotype effect and the head rice recovery was mostly influenced by environmental effect.