According to China's Marriage Law and Adoption Law, the legally established adoption relationship is protected by law, and the rights and obligations between the adopter and the adoptee are governed by the Law on the Relationship between Parents and Children, and the rights and obligations between the adopted child and the biological parents are destroyed by the establishment of the adoption relationship. It can be seen that the legal effect of adoption has two aspects: one is to establish a new legal relationship, and the other is to dissolve the old legal relationship.
The relationship between adopted children and biological parents is a natural blood relationship and cannot be severed. But in the legal relationship, a person can only have one parent, and it is impossible to have two or more parents. Otherwise, social relations will become very chaotic and the legitimate rights and interests of the parties will not be fully protected. When a person is legally adopted by others, there are two kinds of blood relationship centered on him, one is the natural blood relationship between the adoptee and his biological parents, and the other is the fictional blood relationship between the adopter and the adoptee. In the face of these two blood relations, the law must make a choice, and only one of them can be confirmed to have legal significance and be protected by law. From the essence of the adoption relationship, the purpose of the proposed consanguinity between parents and children is to deny or "avoid" the natural consanguinity between the adoptee and his biological parents, legally recognize and protect the consanguinity based on the adoption relationship, and give relevant parties corresponding legal rights and obligations, while denying the rights and obligations between the adoptee and his close relatives, including his biological parents, so as to "sever" the adoptee legally. As for the economic or spiritual mutual help and care between the adoptee and his biological parents and other close relatives after the adoption relationship is established, the law does not interfere.