选取8个有代表性的高原粳稻品种为材料，进行随机区组试验设计，比较了不同品种收获指数、产量和其他主要性状的差异，分析了收获指数与产量及其他经济性状的相关性。结果表明，参试品种的收获指数在0.499～0.545之间，品种间的差异达极显著水平；收获指数与产量、千粒重、结实率、有效穗数、最高茎蘖数、穗长呈正相关关系，但未达显著水平；与株高呈显著负相关，与每穗总粒数、每穗实粒数、着粒密度呈负相关关系，但相关性不显著。以此为据，开展了高原水稻超高产育种的探讨。

The study chose eight representative varieties of plateau japonica rice and conducted randomized block design to compare the differences in harvest index, yield as well as other main characteristics and analyze their correlations. The results showed that the harvest index of different varieties ranged from 0.499 to 0.545, and there were significant differences in different varieties. The harvest index was positively correlated with yield, 1 000 grain weight, seed setting rate, effective panicles, maximum tiller number and panicle length, but not significant; it was significantly negatively correlated with the plant height, negatively correlated with the total grains per panicle, filled grains per panicle, grain density, but the correlation was not significant. So as to carry out the study of super high yield breeding for plateau japonica rice.