Aiming at bring into effect excruciation to defendant, bourgeois are incessant development and perfect, establish no additional punishment resulting from retrial procedure.

针对封建主对重审被告人施以酷刑，任意加重刑罚的现，在禁止不利益变更原则的基础上不断的发展和完善，在再审程序中确立了再审不加刑原则。