The rheological characterization of blends of poly (dimethyl siloxane) (PDMS) rubber and low density polyethylene (LDPE) compatibilized with poly (ethylene-co-methylacrylate)(EMA) has been carried out by using Monsanto Processability Tester (MPT) at different temperatures, shear rates and variable proportions of EMA. The melts are pseudoplastic in nature and the blend viscosities are found to be higher than that calculated by using log-additivity rule. The activation energy of flow is minimum at 6 wt.% of EMA copolymer. The die swell increases with an increase in shear rate, temperature and EMA content. Surface finish of the extrudates deteriorates with increasing shear rate and the temperature but improves with increasing compatibilizer contents. The SEM studies of the compatibilized blends give co-continuous phase morphology at 6 wt.% of EMA. The 6 wt.% of EMA is found to be the optimum loading.