债的相对性决定了作为债的主要表现形式之一的合同也具有了相对性。合同的相对性强调缔结合同的当事人的主体地位,为有效解决合同引起的纠纷提供了捷径。但是,随着社会经济的发展,运用合同相对性原则处理部分合同纠纷也显得力不从心。因此,合同相对性原则的扩张应运而生。 The relative nature of the debt determines the contract as one of the main manifestations of the debt also has relativity. The relative nature of the contract emphasizes the dominant status of the parties who conclude the contract and provides a shortcut for effectively resolving disputes arising from the contract. However, with the development of society and economy, the application of the principle of contractual relativity to handle part of the contractual disputes also seems to be inadequate. Therefore, the expansion of the principle of contract relativity came into being.