摘要：由于建设工程合同具有投资金额大、履行周期长、涉及利益广等特点，如果被判定为无效合同，将无法实现合同目的，甚至可能损害社会公共利益，同时，合同效力的判定也是解决建设工程合同争议的关键要点，因此，应提高对建设工程合同无效情形的认识并采取有效措施进行防范。本文从《民法典》的角度，系统解析合同效力的规范体系和判定标准，结合实践探讨建设工程合同无效的具体情形及其法律后果，并在此基础上提出法律风险防控的具体措施。

关键词：民法典；建设工程合同；合同效力；法律后果；风险防范

Abstract：Due to the characteristics of large investment amount，long performance period，and wide range of interests involved in construction project contracts，if they are judged as invalid contracts，the purpose of the contract will not be achieved and may even harm the public interest. At the same time，the determination of contract validity is also a key point in resolving disputes in construction project contracts. Therefore，it is necessary to raise awareness of the invalidity of construction project contracts and take effective measures to prevent it. This article systematically analyzes the normative system and judgment criteria for the effectiveness of contracts from the perspective of the Civil Code，explores the specific circumstances and legal consequences of the invalidity of construction contracts based on practice，and proposes specific measures for legal risk prevention and control on this basis.

Keywords：Civil Code；construction project contract；contract effectiveness；legal consequences；risk prevention

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建筑经济，2025（11）：46-49