从分蘖消长、成穗率、穗长分布、茎秆粗细、穗粒结构等方面探讨了杂交水稻双本插增产原因。结果表明，双本插本田分蘖较少，无效分蘖时间短，分蘖成穗率达８２．２４％；穗长分布倾向大穗，群体穗型质量好，茎秆粗（倒二节）在０．４ｃｍ以上的数量占９１．６％，且茎粗每增加０．１ｃｍ，每穗总粒数增加３０．１５粒，实粒数增加２２．２３粒，增加量居试验第一；结实率８５．１８％ The reasons for the increase of yield of hybrid rice double insertion were discussed from the aspects of tiller growth, spike rate, spike length distribution, stem thickness and ear grain structure. The results showed that there were fewer tillers, shorter tillering times, and tillering rate of 82.24%. Spike length distribution had a tendency of big spike. The quality of panicle type was good, and the stalk diameter was 2. The number of 4 cm or more accounted for 91.6%, and the stem diameter increased 0.1cm, the total number of grains per panicle increased 30.15, real grain number increased 22.23, increase the amount of the first test; 18%