This is from the origin of law: from the legal effect, the superior law is the most effective, and the subordinate law takes effect under it.
For example, the relationship between the constitution and other legal departments, the constitution is the superior law, because other laws are formulated according to the constitution, and other laws such as criminal law and civil law are subordinate laws.
The principle that the superior law takes precedence over the subordinate law means that when there is a conflict between the normative legal document with higher effectiveness and the normative legal document with lower effectiveness, the normative legal document with higher effectiveness shall be applied. This principle is mainly applicable to high and low grade specifications.