With the strengthening of constitutional authority,concepts such as"fundamental constitutional principles"and"constitutional principles"have gradually become popular in legislation,becoming the basis for constitutional review or judicial application.The tendency to generalize the use of principles in the constitutional field is due to different cognitive perspectives such as prototheory,status theory,and interpretation theory.Although constitutional principles share similarities with policies and values,they possess relative independence.Constitutional principles refer to universally recognized constitutional concepts that are limited in quantity and stable in content.They can be considered as an independent basis for constitutional interpretation.Constitutional principles can be identified through explicit and implicit means,manifesting as different types of principles such as constitutional parent principles,constitutional sub-principles,and sectoral legal principles,thereby forming a network of constitutional principles that influence and constrain each other.Drawing on principle theory for understanding the relationship between principles and rules,the application of constitutional principles involves four modes:balancing,selection,coordination,and supplementation.