自始履行不能的合同,其效力该如何界定,不同国家、不同时期的立法、法学理论呈现了较大的差异,自罗马法以来的传统理论一般认为其无效。而1994年通过、2004年全面修订的国际统一私法协会《国际商事合同通则》采取了一种完全相反的以合同有效为原则的处理方案,其明确规定“合同订立时不可能履行所承担之义务的事实本身不影响合同的效力”,“合同订立时一方当事人无权处置与该合同相关联之财产的事实本身不影响合同的效 From the beginning to fulfill the contract can not, how to define its effectiveness, different countries, different periods of the legislative, legal theory shows a big difference, since the Roman theory since the traditional theory is generally considered invalid. However, the Unidroit General Principles of International Commercial Contracts, adopted in 1994 and fully revised in 2004, adopted a completely opposite solution based on the principle of effective contracts, which explicitly stipulated that “it is impossible to fulfill the obligations assumed at the time of conclusion of the contract Does not in and of itself affect the validity of the contract. ”" The fact that a party does not have the right to dispose of the property associated with the contract at the conclusion of the contract does not in itself affect the contract