合同是平等主体双方达成的协议,市场经济离不开合同,合同的有效、无效直接影响到整个交易安全,关乎到市场经济能否顺利进行。合同的存在并不必然发生当事人所期待的结果,反而可能出现当事人所不愿意看到的结果,这就需要我们从不同的角度去认识合同与合同效力之间的关系,分阶段对待合同效力的各种纠纷。本文以一个具有争议的案例对合同的效力展开分析 The contract is an agreement reached by both parties, and the market economy can not be separated from the contract. The validity and invalidation of the contract have a direct impact on the security of the whole transaction, and it is related to whether the market economy can proceed smoothly. The existence of the contract does not necessarily occur the outcome expected by the parties, but may appear unwilling to see the results of the parties, which requires us from different angles to understand the contract and the effectiveness of the contract between the effectiveness of the contract Various disputes. This article analyzes the effectiveness of a contract in a controversial case