Abstract: Since the mandrel acts as one of the key process tools for material deformation of the MPM,its retaining speed has to be properly determined so as to lessen wear,enhance tube quality and cut down operation cost.With employment of the MPM math model and the SMS Meer-developed two-level automation control process,relevant parameters related to the mandrel retaining speed can be deducted,and then corrected according to the actual operation to get the them optimized.Described here is the process used by New I & S Co.,Angang Group for the purpose of properly determining the mandrel retaining speed of the MPM.