Abstract: Lyocell fiber has excellent mechanical properties.The pleasant hand feeling and appearance of the knitted fabric of this fiber make it very promising for product development and various applications.Furthermore,the advantages of the rotor spun yarn impart its knitted fabric superior quality.The(28 tex) knitting yarns of Lyocell fiber were manufactured by rotor spinning process,and the preparatory spinning technology was investigated.The relationship between process parameters of rotor spinning and yarn quality is researched through comparing the results of spinning trials.The present work has provided a reference for reasonable selection of process parameters and enhancing the quality of the rotor spun yarn of Lyocell fiber.