为明确黑龙江省第二积温带水稻高产育种目标，分析了黑龙江省第二积温带30个水稻品种的产量性状及其相关关系。结果表明，对水稻产量影响较大的第一主因子为每穗粒数，第二主因子为剑叶宽，第三主因子为千粒重，第四主因子为穗长，第五主因子为结实率，第六主因子为株高。在今后高产育种工作中，应将改良水稻株型及提高每穗粒数作为工作基础。

n order to clarify the breeding objectives of the second accumulated temperature zone in Heilongjiang Province, the author analyzed the yield traits and relationship of 30 rice varieties of the second accumulated temperature zone. The results showed that the main factors affecting the rice yield are grain number per spike, leaf width, thousand grain weight, ear length, seed setting rate and plant height. In the future, we should carry out high yield breeding on the basis of improve rice plant type and increase grains per panicle.