The rod-climbing experiment and its relationship to the first normal stress difference of kaolinite particle-suspended polyisobutylene (PIB)/polybutene (PB) systems possessing Boger fluid characteristics (no shear-thinning and highly elastic) were investigated. The rod-climbing constants of the kaolinite/PIB/PB system obtained from the second-order fluid model increased with particle concentration and PIE molecular weight, indicating that the elasticity of the PIB/PB increases as kaolinite particle concentration increases. The first normal stress difference obtained from the rod-climbing constant is also correlated with that measured value using RMS-800, a mechanical spectrometer, for the particle-suspended PIB/PB system.