内容摘要：民法通则规定无民事行为能力人订立的合同无效，纯获利合同除外。但是合同法中却未明确规定无民事行为能力人订立合同效力的问题。此类合同原则上被认定无效存在很多弊端，因此无民事行为能力人订立合同的效力问题亟需要立法完善。本文试从法理及民事行为制度出发，在力求经济、效率兼顾自然过度的基础上制定出一套改革措施：无民事行为能力人订立纯获利益的合同、经法定代理人授权订立的合同或者与其年龄、智力、精神健康状况相适应而订立的合同有效；其他合同无效。

关键词：无民事行为能力人  合同效力   无效合同  可撤销合同

Abstract: The Civil Law states that the contract is invalid  when parties having no capacity for civil conduct , purely making profits contracts are excepted. But The Contract Law have no explicit regulations. It is disadvantageous when this kind of contract is affirmed inefficacy. Consequently, perfect legalization is needed urgently. The text tries to draw up reformed measures that on the foundation of the legal theory and the civil behavior system,considering economic,efficiency and link up natural. The contract is valid when making benefits purely or is authorized to make by statutory agent or appropriate to no capacity person's age ,intellect and mental health.Other contract is invalid. 

Key words: person  have no capacity for civil conduct    The contract effect    invalid contract    revocable contract