Interpretation of constitutionality rules include interpretation rule, conflicts rule and preservation rule. The confusion between interpretation rule and conflicts rule in judicial adjudication needs to be solved by clarify? ing“when the constitution is at play”, and the distinction of the two also clarifies the basic position of interpreta? tion of constitutionality as an independent interpretation method. The interpretation of constitutionality of preser? vation rule and constitutional review are heterogeneous. Unconstitutional doubts as the objective existence of constitutional facts lead to the necessity of preservation rule appearing in judicial adjudication. The application paths of interpretation of constitutionality are different in different constitutional situations, and it can provide specific judicial paths for promoting the implementation of the constitution and the institutional construction of constitutional review. The procedural connection with specific review depends on the initiation of the constitu? tional interpretation claim right of the Supreme People’s Court.