Abstract: The poly(vinyl chloride) (PVC) paste resins produced with different production methods were used to prepare a series of PVC plastisols, and the rheological properties of these plastisols were investigated by using rotational rheometer at a constant heating rate. The particulate morphology, molecular weight and molecular weight distribution of PVC paste resins were investigated by scanning electron microscope, laser particle analyzer and gel permeation chromatography correspondingly, and the relationship between the rheological properties of PVC plastisols and the characteristic parameters of paste resins were established. The results show that, with the increase of temperature, the rheological curves of PVC plastisols including energy-storage modulus, loss modulus, and complex viscosity tended to show a non-normal distribution. These curves demonstrated a four-stage variation in rheological parameters: (I) decrease, (II) slow rise, (III) rapid rise and maximization (IV) decrease. In the first three stages, the viscosity was mainly affected by the particulate morphology. However, with the gradual decrease of rheological parameters in the fourth stage, the viscosity was mainly affected by the molecular weight and its distribution of PVC paste resins.