Real right legalization principle are the types and content of rights can only be prescribed by law. They shall not be invented by the other regulatory documents. The civil rights is not created or changed by the way of agreements from freedom rights. 物权法定原则,是指物权的种类和内容只能由法律规定,而不允许由法律之外的其他规范性文件规定,也不得由民事权利主体通过合同的方式自由的创设或者变更物权。