Substitution decision and assistance decision are the two classic paradigms of adult guardianship. Article 22 of the Civil Code points out the position of applying partial guardianship to adult wards based on the integration of Article 47 of the former Contract Law. Article 35, paragraph 3, of the same law expresses the new concept of guardianship in a textual sense, which is “based on independence, supplemented by safeguards and assistance”. Both articles make it clear that adult guardianship is not full guardianship, but there is a dispute as to whether it should be primarily independent and assisted guardianship or non-independent and substituted guardianship. The understanding of the adult guardianship paradigm should be based on the systematic interpretation of Chapter 2 of the General Provisions of the Civil Code, and the direct interpretation of Article 35(3) as assisted guardianship lacks the value support of other articles. This paper will start from the argumentation of the Civil Code’s legislative technology for the guardianship model and the paradigm it adopts, analyze the problems of the adult guardianship system under the substitute decision, such as the ill-defined scope, the re-marginalization of the elderly, and the emphasis on property rather than human beings, etc., and then finally, through the expansive interpretation of Articles 22 and 33, achieve the unity of the value concepts and scope of exercise with Article 35, paragraph 3, and construct the space of the law for the transformation of the assisted decision.