The first part makes an exposition of the legal nature of ownership reservation . first the author makes on analysis the relevant doctrines after an explicit introduction of the doctrines , then he maintains that it is a kind of guaranty right specifically speaking , a kind of guaranty title 本文共分五个部分：文章第一部分阐述了所有权保留的性质，首先，对所有权保留的性质的学说分歧进行了简要介绍，并分析这些学说，其次提出本文观点，所有权保留的性质是一种权利担保，具体而言，是一种物权担保。
Common law takes the view that the actor should take responsibility of what has done with the precondition of a valid contract . even analyzing the consideration theory of commom law , the unauthorized disposition wont lead to the lack of consideration then make the contract invalid the international demonstration law , representing the development trend of world law , even expresses the theory that unauthorized disposition had nothing to do with validation of contract in a more explicit way in their legislation . hence the countries with advanced civil law all think or tend to mink mat unauthorized disposition contract should n ' t be invalid just only because of the action of unauthorized . china civil law should also follow the trend 英美法系则认为处分人应负权利担保责任，而这一责任承担的前提应是合同有效。即使从英美法系的约因理论分析，处分人无处分权也并不会造成缺乏约因，不会导致合同无效。代表了世界法律发展趋势的国际示范法则更为明确地表达了处分人无处分权与合同效力没有关系的思想。
