本文分析了茎粗，单茎重，叶面积３个因子对亚种间杂交稻赣化７号与品种间杂交稻汕优６３的大穗形成的影响。结果表明：①增加茎粗和单茎重能显著地促进大穗形成，增加上部叶片面积也对大穗形成有利；②赣化７号形成大穗的能力较汕优６３强，且对环境的敏感性较汕优６３弱；③增加物质供应对赣化７号的颖花发育和大穗形成较汕优６３更为重要；④赣化７号增加颖花数主要应促进颖花分化，汕优６３增加颖花数应以促进颖花分化为主，兼顾防止颖花退化 In this paper, the effects of three factors of stem diameter, single stem weight and leaf area on the panicle formation of inter-subspecies hybrid rice Gan-7 and cross-variety hybrid rice Shanyou 63 were analyzed. The results showed that: ①The increase of stem diameter and single stem weight significantly promoted the formation of large panicles and increased the area of ​​upper leaves, which also contributed to the formation of large panicles. ② The ability of large panicle of Gan-7 was stronger than that of Shanyou-63, Sensitivity is weaker than that of Shanyou 63. ③The increase of material supply is more important for the development of spikelets and the formation of bigger ears than that of Shanyou 63. ④ The increase of spikelets of Ganhua 7 should promote the differentiation of spikelets, You 63 to increase the number of spikes should be to promote the differentiation of spike-based, taking into account the prevention of spike degradation