棉花核雄性不育完全保持性受主基因和多基因系统共同控制，以保持系ＭＢ为基础创造的“二级法”实现了核不育性配套利用。本文从“二级法”应用角度对育性主基因和多基因的遗传效应、互作形式及“二级法”应用中有关材料综合基因型的变化作了分析介绍，并对“二级法”杂优利用的特点进行了评述。 Cotton nuclear male sterility fully retentive recipient genes and multi-gene systems under the common control, in order to maintain the Department of MB-based creation of the “secondary” to achieve supporting the use of nuclear fertility. In this paper, the genetic effects and interaction forms of major genes and polygenes of fertility and the changes of the integrated genotypes of materials in the application of “secondary method” are analyzed and introduced from the perspective of “secondary law” "Miscellaneous features of the use of commented.