This research is aimed at investigating torsional properties of two-ply wool yarn after waxing and heat setting. The properties of yarn in weft knitted fabrics influence post-processes such as knitting, dyeing, and finishing. Therefore, pre-treatments of the knitting yarn are required to exclude negative factors in these processes. In this paper two treatments were studied; one was waxing carried out to reduce friction in the knitting process, and the other was heat setting carried out to reduce residual torque. Torque, snarling tendency, and coefficient of friction were analyzed to investigate the effects of waxing, heat setting, or waxing after heat setting. Torque and coefficients of friction decrease and snarling is not significantly changed after waxing. Also, snarling of yarns decreases apparently on heat setting.