Abstract: The fiber conveyor is a key component of the disc swirl spinning frame.It can convey,unwind,and separate fibers.Five kinds of fiber conveyors were designed, and distributions of flow field in the fiber conveyors were analyzed by means of numerical simulation,the relations between the distributions of flow field in fiber conveyors and yarn qualities were investigated.Spinning tests were also made to validate the results.It is proved that yarn qualities can be improved by reducing the included angle between bottom surface and level,or by choosing a fit ratio of outlet area to inlet area,since the distribution of flow field in fiber conveyor is modified in this way.