摘要： 《中华人民共和国生态环境法典》采取的适度法典化模式使其呈现出显著的开放结构。具体而言，法典以多法衔接适用、国际国内规则双向互动形成法源的开放性；通过统摄性条款、动态制度和不确定法律概念的运用，赋予规范体系以开放性。开放结构在回应生态环境治理复杂性与发展性需求的同时，亦产生法源适用模糊、行政裁量权扩张和法律确定性不足等难题。为平衡法典适应性与法的安定性，需以规则性约束明晰法律效力等级与转化规则，以比例原则、类型化方法合理解释开放性概念，以实质性司法审查限定行政权边界，从而精准划定法典开放的限度。

Abstract: The moderate codification model adopted by the Ecological and Environmental Code of the People’s Republic of China endows it with a distinctly open structure. The Code establishes the openness of its legal sources through the integrated application of multiple laws and the two-way interaction between international and domestic rules; it further imbues the normative system with openness through the use of umbrella clauses, dynamic institutions, and indeterminate legal concepts. While this open structure addresses the complexity and evolving demands of ecological and environmental governance, it also gives rise to problems such as ambiguity in the application of legal sources, expansion of administrative discretion, and insufficiency of legal certainty. To balance the adaptability of the Code with the stability of law (Rechtssicherheit), it is necessary to clarify the hierarchy of legal effect and transformation rules through rule-based constraints; to interpret open concepts reasonably by applying the principle of proportionality and typological methods; and to define the boundaries of administrative power through substantive judicial review, thereby precisely delineating the limits of the Code’s openness.