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利用１３个不同类型的陆地棉品种（系）配制成１５个ＦⅠ杂种，再利用其二代（ＦⅠ＿２）配制成１２个二轮杂交种（ＦⅠ），并于１９９４年种植Ｐ、ＦⅠ＿１、ＦⅠ＿２、ＦⅠ＿３、ＦⅠ＿４、ＦⅡ＿１、ＦⅡ＿２７个世代，应用多元分析法，对各世代的纤维强度进行了遗传分析及与主要经济性状的相关分析、通径分析和灰色关联度分析，结果表明：比强度以加性效应遗传为主，显性和上位性效应不显著，狭义遗传力在３７．９７％～８１．５８％之间。亲本及一轮杂交组合中比强度与衣分或皮棉产量呈极显著负相关（ｒ＝－０．３９～－０．７６），二轮杂交组合比强度与２．５％跨长达显著正相关（ｒ＝０．４４），与衣分和皮棉产量呈不显著负相关，单铃重与强度多数世代中均无明显相关（ｒ＝－０．０５～－０．３１）。衣分与强度的负相关是引起皮棉与强度负相关的主要因素，通过二轮杂交后，这种负相关程度降低。
Fifteen FⅠ hybrids were prepared from 13 different genotypic varieties of upland cotton and 12 second-line hybrids (FⅠ) were made from their second generation (FⅠ_2). In 1994, P, FⅠ_1, FⅠ_2, FⅠ_3, FⅠ_4, FⅡ_1 and FⅡ_27 generations. The multivariate analysis was used to analyze the fiber strength of each generation and the correlation analysis, the path analysis and the gray correlation analysis with the main economic traits. The results showed that: The main effect of sexual inheritance, dominant and epistatic effects were not significant, narrow heritability 37.97% ~ 81.58%. There was a significant negative correlation between specific intensity and lint yield or lint yield (r = -0.39 ~ -0.76) in the parents and one cross combination, and a significant positive correlation between the two combinations (R = 0.44). There was no significant negative correlation between the boll weight and lint yield. There was no significant correlation between boll weight and intensity for most generations (r = -0.05-0.31). The negative correlation between the lint percentage and the intensity was the main factor that caused the lint negative correlation with the intensity. After two rounds of crossing, the negative correlation decreased.