Abstract: The response surface methodology was used to study the influences of the gauge and structural parameters of the false twister on the properties of resultant yarns spun by the false-twist compact spinning method. Afterwards, the optimal parameter settings were found by empolying the desirability function approach. The results showed that yarn evenness was mostly affected by the minimum curvature radius of the false-twist channel. While the rotational speed ratio of false twister and minimum curvature radius have remarkable influences on yarn hairiness index. All of the three parameters under investigation have certain effects on the breaking strength and breaking elongation of yarns. The optimization result indicated that when the rotational speed ratio lies 0.367-0.374, the gauge of the false twister is set as 11 mm and the minimum curvature radius of the false-twist channel is 18.2-18.3 mm, the resultant yarns will have a relatively better quality.