Rheological properties of polyamide-modified poly(vinyl choride)(PVC)-sol sealants were investigated. PVC-sol was prepared by plasticization with dioctyl phthalate(DOP). Two kinds of polyamide resins having different amine values and thus different viscosities were compared. The effects of the polyamide types and contents on the viscosities, thixotropic indices, and specific gravities of the PVC-sol were discussed. It was found that viscosities of the PVC-sol sealants were significantly affected by the types of the added polyamide resins, and the thixotropic index of the polyamide-modified PVC-sol sealant was observed to be dependent on the contents(not on the types of the polyamides). The viscosity behaviors of the polyamide-modified PVC-sol sealants aged at 45℃ and the effect of the addition of CaCO₃ were also discussed.