根据单穗结实率的高低，将籼型两用系１１０３Ｓ春繁群体内的穗子分为３类：Ａ类穗结实率＜１００％，Ｂ类穗结实率＞１０１％，但＜３００％，Ｃ类穗结率＞３０１％。Ａ类穗比例大小与群体平均结实率及春繁产量高低呈极显著负相关；而Ｃ类穗比例大小与后两者呈极显著正相关。在泸州，将１１０３Ｓ温度敏感期安排在５月中下旬，是提高Ｃ类穗比例的关键。在此基础上采取增大种植密度，始穗期喷施３０ｇ／ｈｍ２ＧＡ３等措施，能显著增加春繁产量。 According to the rate of single ear seed setting, the ears of 1103S spring group were divided into three categories: the rate of seed set of A was <100%, the rate of seed set of B was> 101%, but <30  0%, C-type ear rate> 30  1%. There was a significant negative correlation between the proportion of panicles in group A and the average seed setting rate and the yield per plant in spring. However, the percentage of panicle C in panicles was significantly and positively correlated with the latter two. In Luzhou, the 1103S temperature-sensitive period arranged in late May, is to improve the proportion of C-type key. On this basis, measures such as increasing planting density and spraying 30g / hm2GA3 at the beginning of heading stage could significantly increase the yield of spring reproduction.