合同法研究领域一直重点关注合同漏洞的填补以及相关填补方法的适用顺序等问题。除了要面对社会经济发展带来的不同新挑战，我国漏洞填补的相关规则在具体适用上也出现不少困惑和乱象。我国合同漏洞填补制度的发展起步较晚，对于相关规则的研究亦存在不足。本文希望透过分析与对比中国大陆和澳门地区在这个制度发展上的异同，系统地反思现行规则的合理性，最后结合域外先发国家的有益经验和理论基础，就我国《民法典》中相关法律规范的完善方向提出建议。中国大陆与澳门地区的漏洞填补制度分别主要规定在我国《民法典》第510条、第511条及第466条和《澳门民法典》第231条。其中，当事人协议、合同有关条款、交易习惯、任意性规范以及合同目的、诚实信用原则是我国法定的填补方法。澳门地区的法定填补方法则有候补规定、当事人订立的填补程序、当事人的假定意思和善意原则。本文第三章讨论了中国大陆与澳门地区采用的填补方法的异同。两地皆采用了当事人意思、任意性规范和诚实信用原则作为填补方法，只是它们在表述上存在差别。至于实质上的差别主要有二：习惯并非《澳门民法典》规定的填补方法；澳门地区随葡萄牙把假定意思视为主要的填补方法。我国《民法典》合同编通则的规定无疑存在改进的空间：其中有些规则过于抽象，许多要件的认定标准和方法亦不明确，它们在理解和适用上也存在不一致甚至偏差，且在应对交易中涌现的新挑战时，现行规则也亦略显不足。面对这些困境，本文就漏洞填补制度的各部分提出了一些改善的方向：分别以单独条文规定合同解释与合同漏洞填补；以“双方当事人明知”作为交易习惯的认定标准；重视并强调诚实信用原则在漏洞填补的功能；明确地列出各填补方法的适用顺序和例外情况等。当中，在独立的条文中明确地列出各填补方法的适用顺序和例外情况供参考的思路如下：任意性规范的优先适用是原则，只有面对特殊情况时，比如在具体适用后发现确实有违当事人的利益时，补充解释才被用于填补该合同的漏洞。

The research field of contract law has always focused on the filling of contract gaps and the application sequence of related filling methods. In addition to facing different new challenges brought about by social and economic development, there is also a lot of confusion and chaos in the specific application of the relevant rules for filling gaps in our country. The development of the contract gap filling system of China started late, and there are also deficiencies in the research on relevant rules. This thesis hopes to systematically reflect on the rationality of the current rules by analyzing and comparing the similarities and differences in the development of this system between China and Macau, and finally put forward suggestions on the direction of improving the relevant legal norms in China Civil Code based on the useful experience and theoretical basis of overseas first-mover countries.The gap filling systems in China and Macau are mainly stipulated in Articles 510, 511 and 466 of China Civil Code and Article 231 of Macau Civil Code respectively. Among them, the parties' agreement, relevant clauses of the contract, course of dealing, default rules, the purpose of the contract, and the principle of good faith are the statutory filling methods in China. The statutory filling methods in Macau include the supplementary rules, filling procedures established by the parties, the presumed intention of the parties and the principle of good faith. Chapter 3 of this thesis discusses the similarities and differences in the filling methods used in China and Macau. Both places use the intention of the parties, the default rules and the principle of good faith as filling methods, but there are differences in their expressions. As for the actual differences, there are two, namely: usage is not a filling method stipulated in the Macau Civil Code; like Portugal, Macau regards presumed intention as the main filling method.Undoubtedly, there is room for improvement in the provisions of the General Provisions of Book of Contracts of China Civil Code: some of the rules are too abstract, the standards and methods for identifying many elements are not clear, there are different opinions on understanding and application of the rules, there are also deficiencies in the rules to deal with new problems that arise in transactions. It is necessary to unify opinions and improve specific applicable rules. Faced with these difficulties, this thesis puts forward some directions for improvement in each part of the gap filling system: stipulating contract interpretation and contract gap filling in separate provisions; using "knowledge of both parties" as the standard for identifying transaction habits; attaching importance to and emphasizing the function of the principle of good faith in gap filling; clearly lists the application sequence and exceptions of each filling method, etc. Among them, the idea of clearly listing the application sequence and exceptions of each filling method in independent provisions is as follows: the priority application of default rules as principle, only when faced with special circumstances, such as when it is found that it is indeed contrary to the interests of the parties after specific application, supplementary interpretation will be used to fill the gaps in that contract.