By controlling variable method, the influence of main process parameters on the machining accuracy of rolling was analyzed from the respect of experiment. The processing mechanism was analyzed according to the elasticplastic mechanics. Through analysis and comparison, the size of surplus was played a decisive role in the processing of the roughness. On the other hand, the influences of feeding and rolling speed on roughnessin at a certain amount of surplus were discussed. The study provides a valuable reference in the application for the actual production of rolling processing.