我国经济合同法对无效经济合同、民法通则对无效民事行为,均未下定义.从现实市场经济发育的情况看,似可将无效经济合同表述为:不符合法定必备条件而成立的、自始不得产生当事人预期的经济后果的经济合同为无效经济合同.从中可以看出,无效经济合同有如下三个特征: China's economic contract law has no definition of invalid economic contract and civil law norms for invalid civil acts.From the real market economy development situation, it seems that the invalid economic contract can be expressed as: does not meet the statutory prerequisites and since The economic contract that can not produce the expected economic consequences of the parties is an invalid economic contract, from which it can be seen that the invalid economic contract has the following three characteristics: