In this study, the optimum process parameters for the strength of the yarn emerging from the sizing process and the efficiency of the sized yarn in weaving machines are determined. Ne 50/1, 60/1 and 70/1 cotton yarn is used. The Dispatch Speed of The Warp Yarn in sizing machine was selected as 40, 50, 60, 70, 80, 90 m/min. Sizing Solution viscosity was chosen as 14, 20, 24 Ns/m2. Taguchi L18 Mixed experimental design was used for analysis of these input factors selected. The Dispatch Speed has been found to be the most influential parameter on the strength of the sized yarn and the efficiency of the weaving machine speed. Optimum yarn strength was found under conditions at Ne 70/1 cotton yarn and 40 m / min the dispatch speed and 24 Ns/m2 sizing solution viscosity. The optimum weaving machine efficiency was obtained under conditions at Ne 60/1 cotton yarn and 70 m / min the dispatch speed and 20 Ns/m2 sizing solution viscosity.