Marriage Law Interpretation (Ⅲ) has caused a strong social response and academic debates ever since its issuance, particularly, the Clause 10 that defines premarital mortgage as personal property. With regard to specific rules, it is necessary to delve into the relationship between separate and common property systems; with regard to values, the supporters attach importance to connection with property law and contract law while ignoring the value of family harmony. The opponents believe that the interpretation violates fair value but lack an in-depth study on the relationship of form fairness and substantial fairness. The paper analyzes the above questions from the perspective of legal principle and reflects on the questions with emphasis on sociology law and law value theory.