由于我国法律法规对“背靠背”条款缺乏明确规范,“背靠背”条款的性质、效力以及处理方式一直广存争议,其引发的争议诉讼多发频发。我国工程建设领域,建设单位拒付、拖欠、延迟支付工程款已成了家常便饭,让承包商头疼不已。“背靠背”条款(PaytWhentPaid),是指合同中负有付款(认可)义务的一方通过合同设置,以其与第三人合同中获得有关款项(索赔)作为其支付(认可)本合同款项(索赔)的前提条件的条款。被形象地称之为“上流有水,下流才有 Since the laws and regulations of our country lacks explicit norms for the ”back to back“ clause, the nature, effectiveness and handling methods of the ”back to back“ clause have been widely disputed. The controversial litigation triggered by them is frequent and frequent. In the field of engineering construction in our country, the construction unit has refused to pay, owed, delayed payment of construction funds has become a routine, let the contractor a headache. ”Back to back “ clause (Pay ) The terms of the contract (claim) preconditions. Be vividly called ”high water, indecent only