本文认为首子信仰是建立在远古壮族家庭社会文化建构之上的一个重要信仰形式 ,这种信仰属于生殖崇拜的文化范畴 ,是远古人类把食与生命、食与生殖联系起来后 ,在食与生殖链条上产生的对首生子的神秘和崇拜。认为首生子具有超凡的生殖神力 ,食之可带来生殖的繁盛和生活的兴旺发达 ,并以此为开端产生一系列的习俗观念和意识。这一习俗观念和意识经过多次的历史变革和漫长的历史演变后已发生了很大的变异 ,但其核心内容却不断地随着社会的发展而沉淀到壮族民间文学的原型结构之中 ,成为壮族伏依兄妹神话、《唱罕王》、《莫一大王》史诗、刘三姐传说中的首子悲剧命运的原型意向 This paper believes that the belief of the first son is an important form of belief based on the social and cultural construction of the ancient Zhuang family. This belief belongs to the cultural category of reproduction and worship. After the ancient humans linked food to life and food to reproduction, The mystery and worship of the firstborn born on the reproductive chain. That the first son has extraordinary reproductive divine power, food can bring reproductive prosperity and prosperity of life, and as a starting point to produce a series of customs and ideas. The concept and awareness of this custom have undergone great variation after many historical changes and long historical changes. However, the core content of the custom has been continuously precipitated into the prototype structure of Zhuang folk literature with the development of society. Become the Zhuang Fu Yi brother and sister myth, “sing the king”, “Mo a king” epic, the original intention of the tragedy fate of the Third Sister Liu legend