Decrease of Entropy, Quantum Statistics and Possible Violation of Pauli Exclusion Principle

We propose that a necessary condition of decrease of entropy in isolated system is existence of internal interactions. Then a theoretical development and some possible examples on decrease of entropy are researched. In quantum region, in particular for some Bose systems, decrease of entropy is more possible. The base of violation of Pauli exclusion principle is unified quantum statistics and attractive interactions, which corresponds also to decrease of entropy with internal interactions. Perhaps, some basis principles have essential relations.