Abstract: V₂O₅ Sol - Gel was prepared from industrial V₂O₅ crystal sheet by the inorganic sol - gelmethod. Viscosity variation of V₂O₅ sols was studied. The thermal analysis of V₂O₅ gels and V₂O₅ crys-tals was taken. The research result indicated that suitable technological parameters for preparation ofV₂O₅ sol - gel are: melting temperature of V₂O₅ crystal being 800~900℃, holding time of meltingtemperature being 5 ~ 10 min. The so1 can form gel when the concentration of sols is higher than 22 g/L. The viscosity of sol will increase as prolonging the placed - time, and the viscosity increases morewhen the concentration is higher. The component of V₂O₅ gels keeps stabilization in heating conditions(below 500℃), and phase transformation does not occur.