The recidivism is a kind of committing crime again, it is necessary to analysis from three aspects crime science, criminal policy science and criminal law, to make a scientific definition.

• 累犯是重新犯罪的一种。应从犯罪学、刑事政策学和刑法学三个方面加以理解，对刑法学上的累犯应予以科学的界定。