The rod-climbing constants of kaolinite-suspended polyisobutylene (PIB) solutions are investigated from rod-climbing experiments, For a low deformation rate, this particle suspended polymer solution can be regarded as a second-order fluid, and the rod-climbing constant for such fluids is correlated with the rheological properties of the particle-suspended polymer solutions. The rod-climbing constants for kaolinite suspended PIE solutions were found to decrease with temperature and increase with PIE concentration, molecular weight of PIE, solvent viscosity, and particle concentration. The rheological properties were measured using rotational. rheometer, and the shear viscosity and the first normal stress difference of the kaolinite suspended PIE solution show the Boger-fluid characteristics.