董事会作为公司的大脑，体现了公司在经营决策和执行业务方面的能力。而要充分发挥这种能力就要召开董事会会议，并在会议中确定、解决公司的重大问题，就公司的重要事务做出决定、达成共识、形成决议。股份有限公司董事会决议效力的研究，可以保障公司正常、有序运行，维护市场经济秩序，确保司法的公平公正。董事会决议是指按照规则，在出席董事会会议的董事达到一定比例的情况下，相关方案经过董事表决后，赞成方案的董事达到相应比例从而获得通过的决定。但是，董事利益在某些方面与公司的利益相差很大，由董事会做出的决议很可能会违反实体上或程序上的规制，导致董事会决议效力的瑕疵。而且董事会决议与股东大会决议在决议主体、决议对象、决议方式、法律相关规定等方面有着明显的不同，不能将它们混同，应该将两者区别开来。本文从效力类型的角度，对股份有限公司的董事会决议效力进行分析。通过详细阐述每种效力类型，分析每种效力类型法理存在的必要性及其法律相应的规定，可以更加清晰的了解董事会决议的效力，对我国现行立法提出相应的建议。首先，本文第一部分对董事会决议这个行为进行分析，对其法律属性进行界定。董事会决议的法律属性应该是共同的民事法律行为。然后，本文对董事会决议效力进行价值分析并仔细探讨董事会决议效力的四种立法模式，确定董事会决议效力的内容。本文的主体部分，即第二、三、四部分，依据立法模式和效力的具体内容分别分析了不成立的、可撤销的、无效的董事会决议。第二部分从具体情形与我国法律规定的不当之处对董事会决议不成立的效力类型进行阐述。第三部分先分析了构成可撤销的董事会决议的要件，之后结合法律的规定对具体的法律事由进行了详细的讨论。第四部分对违反法律、行政法规规定的董事会决议进行具体分析，寻找其内涵，并探讨公序良俗对董事会决议效力的影响。第五部分讲述了在董事会决议不成立、可撤销两种情形下可以进行的效力瑕疵消除，即对决议进行变更或者追认。同时还讨论了决议的对内效力与对外效力的不同。

As the brain in company, the board of directors reflects the company ability of decision-making and business execution in the business. In order to show full role to the ability, the board of directors meeting is necessary. In the meeting, they should solve problems, make decisions, reach agreements and form resolutions. The board must make resolution on the major problems in the production and business operation in the meeting. The research on the effectiveness of Board resolution can make company operating orderly, can preserve market order, and can ensure the judicial justice. Board resolution is a decision, which can get through in the board of directors meeting according to the relative law. However, the board of directors is not completely consistent with the company in interests. Due to various reasons, the resolution made by the board of directors is likely to be in violation of the entity or procedural regulation, which leads to defect in the effectiveness of the Board resolution. In addition, resolution of board and resolution of the shareholders meeting are different in subject, object, methods, and legal rules. This paper analyzes the effectiveness of Board resolution from the aspect of types. By researching the effectiveness of each type in detail, the necessity and legal theory of each type are analyzed in order to have a clear understanding of it and make some recommendations to our national law. Firstly, the first part of this paper is to analyze the behavior of Board resolution and to define its legal attribute. This paper argues that Board resolution belongs to common law behavior. And then analyze the value of the effectiveness of Board resolution, discuss the four legislative modes in Board resolution, determine the content of the effectiveness of Board resolution. Secondly, the main parts of the paper include the second, third, fourth part. These parts respectively analyze the unestablished, revocable, invalid Board resolution. The second part states that Board resolution is not exist from the concrete situation and the inappropriate of law. The third part analyzes the abstract elements of a revocable Board resolution. And then give a detail discussion about specific legal reason. The fourth part explains the concrete connotation of violating mandatory law and the influence of public order and moral on Board resolution effectiveness. The fifth part tells that ratification and modify can make impossible and invalid Board resolution validity. Also discusses the difference in internal effect and external effect of Board resolution.