The subject study uses ceramic materials as a circular burnishing-tool connected with a ring-form electrode to construct a compound circular finishing-tool. In the machining process, the external cylindrical workpiece is put into the compound circular finishing-tool to execute the finishing process by automatic continuity production. By the compound production effects from the electrode and the burnishing-tool, it achieves synchronous execution of multiple effects of electrochemical finishing and burnishing. Thereby rapidly and highly efficiently making improvement on the surface roughness of external cylindrical surface; and by the burnishing process and electrochemical finishing, it enhances the mechanical properties and cleanliness on the materials surface. It is expected that the entire study could make a comprehensive assessment of the compound process characteristics of the circular burnishing-tool and automatic continuity synchronous burnishing and electrochemical finishing, seeking the optimal electrode design and experimental parameters, so that polishing techniques for the external cylindrical can be extensively applied in the future.