Abstract: Aqueous polyacrylic size was synthesized by solution or emulsion polymerization,then,the resultant product was converted into the powdery size through sedimentation,drying,and crush break.The adhesive strength with pure cotton,polyester and T/C blended roves of both the aqueous and powdery sizes were tested respectively,and the results showed that the preparation method of the powdery polyacrylic size is feasible.