Mechanical degradation of Polycarbonate (PC) has been studied by using a homomixer at room temperature. The degree of degradation was determined by measuring the number-average chain length at various stages of mechanical degradation. It was found that the rate constant of mechanical degradation (ks) decreased with the degree of polymerization of PC at the initial stage of degradation. From the effect of Dimethylformamide (DMF) solvent on the degradation of PC, the maximum rate was obtained at 60%.