ContractLawwasenactedandtherearethreetypesoftheoryabouttheunauthorized-dispositioncontractthatisvalidinvalidandundeterminedvalidity.Theunauthorized-dispositioncontractisviewedvaliditytobedeterminedwhichisstipulatedinarticle51ofContractLaw.Thistheorygraduallyrevealeditsinherentdeficiencies.Sincethenatureoftheunauthorized-dispositioncontractisacreditactitsvalidityshouldnotbeinfluencedbythedispositionrightandshouldbevalid.Thereasonwhyarticle51ofContractLawwascriticizedliesinthepatternofalterationofrealright.Keywords:unauthorizeddispositionvalidityofcontractalterationofrealright