Based on the features of roll grinding and the third party CNC systems which cannot used to control roll grind directly,the CNC systems which meet the demands of roll grinding were designed. The global functions of roll grinding and the structure characteristics of roll grinding machine tools were researched.The implementations of hardware configuration and architecture of hierarchy function tasks which applied in the CNC systems for roll grinding were proposed. After the functions characteristics which were needs in the processing of roll grinding were researched, the detailed implementing methods of grinds functions were proposed. The designed CNC system was used to carry out grinding experiments to test its grinding control ability.The results show the CNC systems can fulfill the demands of roll grinding functions.