Filial support legislation in the USA has a long history. It has complete legislative structure,and its scope of subjects of litigation related to filial support is wider.In addition,it has a set of more perfect system of legal remedy. But because of the limitation of federal system,there exist differences between the filial support laws from different states. And to some extent that enhances the cost of law enforcement. Meanwhile,federal government and state government in the USA have different kinds of fund support plans. The factors above interfere with the role of filial support laws. But ...