How to legal settle when a property involed protection of property right, the acquisition in good faith of thievery and accession. And regarding the accession with the stolen goods, this article will explain the nature that loss of rights holders can use unjustified enrichment to request the damages. Finally, regarding the modern unjustified enrichment, this article thinks the supporting theory, it should be limited in content or explained the difference of the substantive rights to help to attain the result of the appropriate use of theory.