Abstract: In this paper, the fiber tension distributions in the Sirospun spinning triangle was analyzed by using the finite element method according to the mechanical properties of fibers and the feature of Sirospun spinning triangle. The effects of spindle speed, traveller and twist factor on the distribution of fiber tension in the spinning triangle were analyzed in detail. The results indicate that the spindle speed has an apparent influence on the distribution of fibers at the spinning triangle, and the relationship is closely between the fibers force and the direction of spinning tension, and the twist factor has an important impact on the structure of spinning triangle. The analysis result of FEM matching with the theory of spinning achieved the optimization of spinning processing parameters, which has some referance value to spinning practice.