Abstract: The basic performances of milk regenerated protein fiber and the characteristics of sirofil spinning processes were introduced. According to practice in spinning process,some experiments on the primary processing parameters of the milk sirofil spinning yarn were carried out,and the influences of spinning factors on blended knitting yarn quality of milk regenerated protein fiber/VFR was analysed by the spinning processing.The results can be used as a reference data for improving the quality of blended milk regenerated protein fibers and developing the new products further.