Which principle of China's criminal law embodies the heavier punishment for recidivists?

Principle of adaptation between crime and punishment

The severity of punishment should be commensurate with the crimes committed by criminals and their criminal responsibilities.

Its meaning is: how big the crime is, how much criminal responsibility will be borne, and the court will also impose corresponding heavy punishment, so that the felony will be severely punished, the misdemeanor will be lightly punished, and the crime and punishment will be commensurate; When analyzing the seriousness of crime and criminal responsibility, we should not only look at the objective social harm of crime, but also consider the subjective viciousness and personal danger of the perpetrator, and grasp the degree of social harm comprehensively reflected by various factors of crime and criminal, so as to determine the degree of criminal responsibility and apply the corresponding heavier punishment.