In order to assess taste quality of main japonica rice varieties in China, and illustrate exact proportion of varieties meetingthe requirements of the standard China Good Grain and Oil — Paddy, 333 samples of japonica rice varieties were collected and their indexes including taste quality, protein content and chalkiness were detected and analyzed. The results revealed that for tastevalue the proportion of the varieties which met the requirements of the standard China Good Grain and Oil was about 42%, which equals to about 37% calculated by promotion area; for chalkiness the proportion was about 90.5%. The average content of crude protein was 8.8%, in which the proportion of samples with the value lower than 8% was 22.1%. It provides a theoretical support for further optimizing standards and effectively promoting action plans in grain and oil in future by getting exactly the general situation of japonica ricequality in China.