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Ａ、对各地区纯系亲鳖进行严格优选，并排列组合进行正反一级单杂交；同时对一些相关优选纯系进行近亲杂交。以备作对照组进行后期对应性配合力测定和研究。Ｂ、进行一级单杂交种的特性优选，并分出父母系全力位排列组合进行二级二元正反杂交。Ｃ、优选出最佳二级杂交组合，进行父母系双杂四元组合，获取四元杂交种。Ｄ、将父系中四元杂交种进行多元组合，以获多元雄性优势：并与四元母系进行杂交，获得最佳全息商品种。
A, the purebred turtle in all regions strictly selected, and arranged in a combination of positive and negative single hybrid; the same time, some of the relevant preferred pure lines inbred hybrids. To prepare for the control group for the late mating with the determination and study. B, the characteristics of a single hybrid selection of the best, and the separation of the full arrangement of the Department of the Department of the two binary positive and negative hybridization. C, the best secondary hybridization is selected, the parents of two-hybrid quaternary combinations to obtain four-hybrid. D. Plural combinations of four-way hybrids in the paternal line to obtain the multiple male advantage: hybrids with the quaternary maternal lines are obtained and the best holographic commercial varieties are obtained.