The solvent residue, thermal stability and dynamic rheological properties of industrial grade Poly (propylene carbonate) (PPC) were characterized by Gas Chromatography (GC), Thermal Gravimetric analysis (TG), Rotational Rheometer and Melt Index Meter. The GC results showed that PPC contained 1.281wt% residual monomer propylene oxide. The TG results indicated poor processing thermal stability of PPC. The rotation rheological results further revealed poor processing thermal stability of PPC. The degradation of PPC was more intensified for great heat because of huge amounts of energy consumed in the friction processing of between the molecular chain. Therefore, the shear rate should not be too great for preventing serious degradation in characterization. The results of melt index indicated that under the requirements of the conventional processing, PPC had proper fluidity when the processing temperature reached 180℃. PPC manufacturers should reduce the molecular weight with the narrowing of molecular weight distribution to improve material flow and thus greatly reduce the difficulty in processing.