How is constitutional law different from other forms of law, such as statutory law, common law, treaties, or administrative regulations?

1.  It is made in a different way: Either by the framers in Convention in 1787, ratified by the state legislatures, or proposed by Congress and ratified by state legislatures. 

2.  It is harder to change than other forms of law, requiring super-majorities in both houses of Congress (2/3) and ratification by 3/4 of the states.

3.  In general, it deals with more fundamental questions than most other forms of law--the setting up of government, the distribution of power within government, and the guarantee of basic rights.