通过对４个不同稳产性晚粳稻品种在不同条件下的栽培试验，研究了不同稳产性双季晚粳稻的产量构成特点及其生理特性的差异，结果表明：不同稳产性晚稻的产量构成及其稳定性存在明显差异。稳定性好的晚粳稻，其有效穗数中等，每穗总粒数较少，实粒数中等，结实率较高，并且它们的可塑性大，但千粒重高而稳定；稳产性好的晚粳稻，其分蘖力中等，单株最高分蘖和有效穗数相对较稳定，而分蘖成穗率高并具有一定的可塑性，齐穗期的叶面积指数高而且稳定，但单株叶面积则表现为相对可变性。稳产性好的晚粳稻齐穗期叶片的含氮量较高，叶绿素含量中等且较稳定。稳产性好的品种单茎干重大而稳定，收获指数高并有一定的稳定性。 Through the cultivation experiments of four japonica rice varieties with different stable yields under different conditions, the differences in yield components and physiological characteristics between two stable late japonica rice varieties with different stable yields were studied. The results showed that the yield components of late stable japonica rice varieties with different stable yields and their There are significant differences in stability. Good stability of late japonica rice, the effective panicle is medium, the total number of grains per panicle less, the real number of grain medium, high seed setting rate, and their plasticity, but high and stable thousand grain weight; good stability of late japonica rice, Its tillering ability was moderate, the highest tillering and effective panicle number per plant were relatively stable, while the tillering panicle rate was high and had some plasticity. The leaf area index at heading stage was high and stable, but the leaf area per plant was relatively transsexual. The high nitrogen content and high chlorophyll content in late heading stage of late japonica rice with good and stable yield were relatively stable. Stable and good varieties of single stem dry large and stable, high harvest index and a certain degree of stability.