债务承诺系承诺人利他单方法律行为,无须遗留债权人的同意即可生效,但不允许承诺人随意撤销;提供承诺与否是承诺人意思自治的体现,但承诺一旦生效,则承诺人强制性地对公司注销后确定的遗留债务承担责任;债务承诺是债务加入的一种形式,适用债务加入的规则,但应当限制承诺人援用原因关系行使抗辩权。 Debt commitment is the promisor’s altruistic unilateral legal act, without the consent of the remaining creditors to enter into force, but does not allow the promisor to arbitrarily withdraw; the promise of commitment is a manifestation of the autonomy of commitment, but the commitment, once committed, the promisor mandatory Debt commitment is a form of debt to join, apply the rules of debt to join, but should limit the promisee to use the relationship between the reasons to exercise the right of defense.