In order to study the effect of the cylindrical centerless grinding without dressing and grinding on the outer ring of bearing ring，the outer ring of 6202 deep groove ball bearing ring was used as the research object. Cylindrical centerless grinding tests were conducted to analyze the effect of the new cylindrical centerless grinding process without dressing on the roundness and diameter of the bearing ring. The harmonic control principle was utilized to investigate the control of harmonic on the roundness during grinding. The results show that the new process achieves the dimensional accuracy requirements of 6062 bearing ring. The method of increasing the machining allowance first and then decreasing it during cylindrical centerless grinding is helpful to improve the roundness of bearing ring， shorten the process flow， reduce the production time and improve the production efficiency. Centerless grinding effectively reduces low-order harmonics， while cylindrical superfinishing efficiently reduces high-order harmonics on the ring surface to control roundness. In conclusion， the novel cylindrical grinding process without dressing can improve product quality and production efficiency..