The current law of our country implements a single-track system in paternity determination, which is reflected in the strict registration of identity relationship and a single model of complete adoption effectiveness. This may deprive de facto parent-child relationship of an effective protection of the law. The fact that legal parent-child relationship between the adopter and the adoptee in the adoption relationship completely replaces the natural blood paternity is contrary to traditional Chinese family ethics. The implementation of the dual-track system of parent-child relationship can take care of both the natural blood paternity and legal paternity , which is more conducive to the realization of the principle of children's best interests and more in line with the current social situation in China. It is suggested that a dual-track system of parent-child relationship should be established by adding an identity possession system and an incomplete adoption system as a supplement to the existing parent-child system in China, so as to meet the needs of complex social life.