Summary: The solubility parameter is calculated to express the magnitude and nature of the interactive forces between the polymers and solvents. It measures the affinity between the components of a mixture. To improve the prediction of the solubility parameter, the group contribution method is used to calculate the overall solubility parameter as suggested by Hildebrand. Hildebrand�s method is used to predict the interaction between the polymers and solvent. In this study, calculate the solubility parameters of polysulfone (PSU), polyvinyl acetate (PVAc) polymers and dimethylacetamide (DMAc) solvent by Hildebrand method. The PSU and PVAc solubility were found to be 1.52H and 1.7H, respectively. These solubility values show that both polymers were dissolved readily in the DMAc solvent, resulting in a true solution. © 2019 Chemical Society of Pakistan. All rights reserved.