Conclusion is made that new spinning technology should be based on hi-velocity,hi-robotization,hi-automation,large package,wide application of raw material,seperation of twisting from winding,minimization of twisting trangle section,improvement of yarn structure,reduction of hairiness.

Contrast analysis is done to the domestic cotton spinning frame equipped with the self-developed centralizing device with double suction grooves for the cotton yarn of same fineness regarding yarn structure and property of yarn produced in compact-siro spinning process under the same condition.

However, the researching work on the spinning mechanism of compact spinning technology and its yarn structure is very little for its short developing history.

It also defines the main specification parameters such as yarn construction, yarn specification, fabric specification etc and their influence over the product style, product quality and production process and advances thc concrete ways of determining the fabric specification parameters.

Design and spin fancy yarns with polyester filament,mainly spiral yarn,seed yarn and circle yarn,and test the fineness,tensile break strength,elongation and twist of the spinned yarn,which provides the material performance basis for the late fabric design.