应用增广ＮＣⅡ设计对１０个海岛棉品种（系）的Ｆ１代纤维比强度进行了分析。配合力分析表明，父本间一般配合力差异显著，特殊配合力间存在着明显差异；海岛棉纤维比强度的遗传主要受加性作用控制，显性作用和上位性作用显著；在非加性方差中，上位性作用比显性作用相对重要些；比强度的狭义遗传力较低。现有亲本中，Ａ杂交铃是比强度最好的亲本。 The F1 hybrid fiber strength of 10 island cotton varieties (lines) was analyzed by using extended NC Ⅱ design. The analysis of combining ability showed that there was significant difference in general combining ability between male parents and significant difference in special combining ability. The inheritance of specific intensity of island cotton fiber was mainly controlled by additive effect, dominant effect and epistatic effect. In variance, the epistatic effect is more important than the dominant effect; the narrow sense of heritability of specific intensity is lower. Among the existing parents, A hybrid bell is the best parent of intensity.