Polishing is usually the last working procedure of making die surface. The roughness of die surface affects using performance of die directly; therefore, surface roughness is a key factor to scale quality of die surface. The paper focuses on affecting factors of polishing surface roughness, including the rotation speed of polishing head, floating force on polishing head, pass of polishing head movement, feeding rate of polishing head, and size of abrasive particles. Then, establish the parameters database in order to select appropriate technological parameters expediently. These results are used as operating guides for applications of die polisher.