预期违约与不安抗辩制度比较与完善王丽萍合同依法成立后，即受法律保护，当事人应恪守信用，履行合同。由于市场交易的多变、复杂性，有的当事人在合同履行期限到来之前，明确肯定地向对方表示将不履行合同，也有的当事人的行为或客观事实表明其在履行期限到来之时将不履... Expected breach of contract and uneasiness defense system comparison and improvement Wang Liping After the contract was established according to law, that is protected by law, the parties should abide by the credit, the performance of the contract. Due to the variety and complexity of market transactions, some parties explicitly and affirmatively indicate to the other party that the contract will not be fulfilled before the expiration of the contract period, and some of the parties’ actions or objective facts indicate that they will not perform at the expiration of the performance period. ..