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，任意加重刑象，资阶级不利益变更原则基础上不断发展和完善，再审程序中确立了再审不加刑原则。