Based on related genealogy and first-hand materials in fieldwork, this essay analyzes many adoption cases and comes to the conclusion that the fundamental reason for adopting aliens is the inner struggle among the branches of clans.

• 根据有关宗族的族谱 ,以及通过实地调查获取的第一手资料 ,在分析很多收养案例后得出结论 :宗族内部的分支争斗是导致收养外人这一异常形式存在的根本原因。