通过对４０个太湖粳稻品种１４个品质性状的研究，综合评价米质的分级标准，该分级标准同实际情况完全吻合。５个形态性状对米质的影响依次为：熟色＞叶开张角＞株高＞穗长＞叶基角；８个农艺性状对米质的影响依次为：生物产量＞经济产量＞每穗实粒数＞总粒数＞结实数＞穗数＞千粒重＞抽穗天数 Based on the study of 14 quality traits of 40 Taihu japonica rice varieties, the grading standards of rice quality were comprehensively evaluated. The grading standards exactly matched the actual situation. The effects of five morphological traits on the quality of rice were as follows: ripe color> leaf open angle> plant height> spike length> leaf base angle. The effects of eight agronomic traits on rice quality were as follows: biological yield> economic yield> Number of grains> Total number of grains> Seed number> Number of spikes> Thousand grain weight> Number of days of heading