Qianyou88, Neiwuyou39, Yliangyou5845 and Liangyoul43, of which yield were more than 13 500 kg/hm2 in project of "planting three to produce four" implemented in Xingyi city of Guizhou province, were selected to analyze their main high yielding traits.The results showed that the yield of the four rice varieties were all over 14 400 kg/hm2; among the four varieties, Liangyou143 had the largest tillering ability (29.04 tiller/plant), but its effective panicle number did not have significant differences compared with other three rice varieties, and the panicle rate was significantly lower than other three rice varieties; Qianyou88 produced the least of ineffective tillers, and the panicle rate reached 76.69%; after tiller control, the Neiwuyou39 showed a relatively good results, and the fallen rate of tillering capacity was the fastest; Yliangyou5845 had the highest actual yield by 1 470.99 kg/hm2, but did not have significant differences in panicle length, grain number per panicle, 1000-grain weight and seed setting rate in comparison with other three rice varieties.Comprehensive consideration of each yielding trait, Neiwuyou39 and Yliangyou5845 are easier to gain high yield.%在贵州省兴义市“种三产四”工程中选取产量超过900 kg/667m2的杂交水稻品种黔优88、内5优39、Y两优5845、两优143,对其高产潜力与主要经济性状相关性进行了研究.结果表明:4个水稻品种产量均超过960 kg/667m2;4个品种中以两优143的分蘖力最大,达到29.04个/株,但其有效穗数与其他品种间无显著差异,成穗率则显著低于其他品种；黔优88的无效分蘖最少,成穗率达到76.69％;在控蘖以后,内5优39表现出较好的控蘖效果,分蘖势下降最快；Y两优5845实际产量最高,达980.66kg/667m2,在穗长、穗粒数、千粒重、结实率上,与其他3个品种间均无显著差异.综合考虑各产量性状特征,内5优39和Y两优5845更容易获得高产.
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